文档库 最新最全的文档下载
当前位置:文档库 › 《大学英2》(专科)作业

《大学英2》(专科)作业

《大学英2》(专科)作业
《大学英2》(专科)作业

《大学英语2》课程作业

适用层次:专科培养类型:普通函授专业班级:姓名:学号:

作业要求:作业可打印,答案要求手写;考试时交作业。

REVISION EXERCISES 1

1 Fill in the blanks with the words given below. Change the form where necessary. Crisis resent motion proceed self-evident

Emerge stick feasibility survive owe

Slightly appoint hazard host existence

Influence spring perform hesitate name

Obtain impulse smash widen faint

Reject conflict crash action threaten

1. Many young writers of that time were ____ by Hemingway, who they thought had revolutionized the technique of writing.

2. His parents ___ him after his great grandfather, who was a Supreme Court Justice.

3. Racial discrimination in America has led many people to conclude that that all men are created equal is a ___ lie.

4. The plane ___ into a building when it was landing. Not a single passenger ___ the tragedy.

5. The attention of the guests was drawn to the corner of the room where a heated argument had ___ up.

6. The ___ did not sit down until he was sure that all the guests were comfortably seated in the room.

7. Think twice before you take action. To act on _____ is not likely to do you any good.

8. Unexpected weather conditions have made our task difficult to ____ .

9. The southern states ___ to declare independence if Lincoln became President.

10. The chairman of the committee _____ the idea as unfeasible.

11. You should not _____ criticism. It will only do you good if you learn to take it wisely.

12. George Washington ______ Thomas Jefferson to be his secretary of state.

13. _____ interests drew the two friends apart.

14. Is the elephant the biggest land animal in _____ today?

15. _____ speak louder than words.

16. She has gone out of her way to help me. At least I _____ her my thanks.

17. I was brought up to think that a person should not ____ to speak the truth.

18. Since he is unable to _____ financial support, going to college remains a dream for him.

19. When dinner was over, mother ____ to me to come closer to her and told me that

I could leave the guests now and _____ with my own business.

20. There is a ____ smell of gas. Let's open the windows.

21. The Yangtze River ______ as it flows further east.

22. Many old people in America still have a vivid memory of their life during the economic(经济的) _____ of the 1930's.

23. A research group has been set up to work on the ____ of producing a pollution-free automobile.

24. We saw the ship _____ in the distance. We could even see its mast(桅杆), which ______ up about three meters at its head.

25. No one is denying now that smoking is a _____ to health.

26. Several windows were _____ to pieces during the storm.

27. Don't worry. He is sonly ______ wounded.

2 Rewrite the following, sing the words or expressions given in brackets:

Example:

Thomas Jefferson steered his ship with confidence and hope, not with fear.

(leave behind)

Thomas Jefferson steered his ship with confidence and hope, leaving fear behind.

1. The professor went to Europe. He told me to work on the project alone.

(leave behind)

2. The only witness(证人)to the murder died shortly afterwards.

Who the murderer was has remained an unsolved mystery. (leave behind, as to) 3. The boy slams the door against anyone he doesn't like. I hope he will quit that habit as he grows older. (outgrow)

4. He is still young. He will not be so mad about pop singers as he grows older

and more mature. (outgrow)

5. You said we had an argument last night. I think discussion is a better word for it. (prefer)

6. The college accepts students in spring as well as in fall. I want to go there in spring. (prefer)

7. The Petersons are looking for someone to babysit for their daughter.

They want a girl who is kind and patient. But most important of all she must be reliable. (above all)

8. He was a writer and a literary (文学的) critic. But most important of all he was a statesman. (above all)

3 Replace the underlined parts in the following sentences with words or expressions you have learned from Units 1-3:

1. The story has two parts.

2. Virginia got its name from the Virgin Queen.

3. I don't think the idea can be put into practice. One reason is that we don't have the necessary funds. Another reason is that we don't have the manpower needed to complete it.

4. He is a man who always does things according to principles(原则).

5. The captain's command was heard loud and clear in the silence of the night.

6. He was wounded in the head two days ago. It will be a long time before he regains consciousness.

7. The boy was sitting in a corner of the room. He ran toward the door as soon as he saw his mother coming in.

8. Bad weather has caused a delay in the launching(发射) of the satellite.

9. Social Darwinism(达尔文主义), as the term suggests, is developed from Darwin's theory of natural selection(自然选择).

10. Ask the other s when they will be free for the conference. As for me, any time next week will do.

11. The police dogs are specially trained to search and find burglary suspects.

12. Something is wrong with the electric heater. It no longer emits heat.

4 Complete the following sentences by translating the Chinese into English:

1. You screamed at me ._______________ (你得向我道歉 (apology)) (owe).

2. _______________ (这部小说的依据是) the life stories of some of my best friends.

3. The moon does not emit heat. _______ (它也不发光)

4. It is a good idea for those running for public office to ______(公布竟选基金的来源).

5. ________________ (教授继续讲课) after he answered a student's question.

6. As the plane was running low on fuel (燃料), ______(我们不得不飞向最近的机场.)

7. The boy needs encouragement. __________ (过多的批评只能阻碍他的智力发展).

8. __________(空气如此不适宜于呼吸) that some people think we will have to wear oxygen masks soon.

9. ______________ (如果你不愿去剧院), why don't we just wit here and chat?

10. ______ (人群中传出欢呼声) as people watched the debate between the president and his opponent in the conference hall.

5 Cloze

put in the missing words:

some people argue that , since there are billions of stars in our universe, at least millions of them must have planets. And if there are (__1__) of planets, at least thousands of them will have (__2__). And of these life forms, at least some will (__3__) intelligence(智力). At some point of their te(__4__) development, these intelligent beings will think of communicating with (__5__) on other planets. Some astronomers have (__6__) up a radio telescope at Harvard University. Dr. Paul Horowitz is using the (__7__) to scan (扫视) the skies for any signal (__8__) from other planets.

I have a plea for these gentlemen: please stop before it is too (__9__)!

For one (__10__), what if these beings that are in existence on other (__11__) do give us a message? What if the message (__12__) that these beings are far superior to us? Will we be (__13__) to survive the knowledge of our own unworthiness and inferiority(低劣)?

For another, what (__14__) these beings tune in and find us? Will they be friendly (__15__) us if they find that we can be worse (__16__) animals and that we are capable of (__17__) except polluting the atmosphere, killing(__18__) other as well as other species, and spoiling everything (__19__) our beautiful planet? Think what they will

(__20__) to us, if they are unfriendly!

So, gentlemen, please stop looking for trouble!

6 Translate the following into English:

1.小女孩慢慢长大后就不会再怕宠物(pet animals)了.

2.我认为你不应立即照他的建议行事,想想是否还有更好的选择.

3.埃费列特(Everett) 教授携妻子度假去了,留下三岁的女儿由保姆照顾.

4.就这些山区村民而言,污染目前尚不是一个大威胁.

5.太阳发出光和热,这是地球上人们的主要能源.

6.对这次地夸大可能的成因科学家尚未能作出结论.

7.你不必特地来看望我们,但任何时候你都将是个受欢迎的客人.

8.美国宪法起初由七章(articles) 组成,迄今已增加了二十七条修正案(amendment). REVISION EXERCISES 2

1 Fill in the blanks with the words given below, Change the form where necessary charge live relax intelligent

vague detail flee trail annoy

contented bother force rise

anticipate arrest best turn

handle unlike possess reveal

split tend err corresponding

style reinforce anyway advance

close dwell

1. What he said ____ an important clue as to who ____ the weapon the murderer used.

2. we ____ bad weather. But we had never thought that it would be a storm like that.

3. I have a ____ impression that he comes from a very influential family.

4. The hat he bought last summer is out of ____ now.

5. The hotel guests were really ____ at having to wait so long to make a telephone call.

6. ____ their fathers and grandfathers, the young people certainly will not remain ____ with a life of isolation in this village. They want to see the world outside and to taste its excitement and opportunities.

7. This photo shows Tom's father at his ____ .

8. To ____ is human. But no ____ person makes the same error over and over again.

9. We still have some time left before the exam. Why don't we just ____ and have

a cup of coffee?

10. How could you expect me to remember every ____ of the accident? It that would ____ me.

11. The hostess arranged to have me sit by a ten-year-old boy and asked me if that would ____ me.

12. Almost all the black people in that city ____ out on election (选举) day. They were confident that this time they could vote their own candidate into office.

13. It's true that John's joining us ____ our team, but we would have won ____ .

14. No one is perfect. We have to ____ with the knowledge of our own imperfections.

15. The gunman _____ at the sight of the ;policemen.

16. Every year at this time people in the surrounding country come in ____ to seek jobs in this city.

17. He has been ____ and will face criminal ____ for cheating others out of their money.

18. The situation is growing out of control. We need someone more skilled to ____ the crisis.

19. They seem eager to have me work for them. They have even offered to pay me in ___ if I promise not to accept any other job.

20. Don't ____ on your past achievements, GO and set new goals.

21. He wanted to ask me a question, but his voice ____ off when he saw that I was watching TV with great interest.

22. Unemployment (失业) is on the ____. Will it cause a ____ rise in crime?

23. The meeting finally drew to a ____ when the chairman finished his speech.

24. Some people ____ to remember the favors they do others and forget the favors they receive.

2 Study the use of the word "case" in the given examples and then use it to rewrite the following sentences:

Examples: This is an emergency case.

A case in point is students in New York State who face criminal misdemeanor chares for possessing and selling advance copies of state Regents examinations.

But in the case of Lincoln , the story is true.

1. Today the doctors will only have time to deal with patients who are seriously ill.

2. Cancer may not be deadly. My friend John, who has survived lung cancer for many years, is a good example.

3. Many intelligent animals can be trained to understand human speech. The pet dog is a good example.

4. Generally speaking, starting a business without any previous experience will involve many difficulties and risks But everything has been fine with me.

5. Many people believe that cheaters will inevitably be caught. But as far as many American politicians are concerned, this does not seem to be true.

3 Study the phrase "come to" in the examples given below and then use it to rewrite the following sentences:

Examples: The American comes to with a start. In India, mild in a bowl means only one thing - bait for a snake.

We were hopeless when it came to identification.

Such stories point out quite clearly that children who lied, cheated or stole came to bad ends.

1. I am sure that he will regain consciousness in an hour.

2. I am not sure what all this empty talk will lead to.

3. In discussing complicated situations or relationships, words are seldom adequate.

4. Our efforts at convincing his as to the feasibility of the plan did not bring us any result.

5. Tom is not much of a scholar. But no one organizes group activities better than he does/

4 Study the sentence pattern in each of the given examples and then use it to rewrite the sentences that follow:

Example: 1: If I wasn't able to avoid a mistake, chances were that no other surgeon could have, either.

a. If nothing goes wrong, he is likely to recover in a month after the operation.

b. We have a better than 50-50 chance to win this time. At least that is how it looks to me.

c. The disease is contagious, He will probably get it.

d. He will probably be found guilty(有罪的). The evidence is against him.

Example 2: It can be argued that such a response may not mean much.

a. There is some reason to think that formal education should not be made a requirement for public office.

b. There is reason to believe that bringing back the death penalty will not help reduce crime.

c. There is reason to think that stiffer sentences will only result in an increase in violent crimes.

Example 3': Signs of dishonesty seem more numerous in recent years. Could it be that we are getting better at revealing such dishonesty?

a. He is late for class again. Is it possible that he is held up by traffic again?

b. The boy has a high fever. Is it possible that he has caught the flu again?

c. Someone is knocking at the door. Is it possible that Sam is returning from school?

5 Complete the following by translating he Chinese into English:

1. War has been threatening these people for decades and ______________ (他们似乎已学会接受这一现实了).

2. Their friends have little doubt that _________ (他们婚姻的结局将是离婚).

3. The commander was so kind that on many occasions ____________(我都几乎想对他直呼其名了).

4. I put up an advertisement in the newspaper for the sale of my car but ________(到目前为止尚无回音).

5. When I was answering the exam questions I was so nervous that ___________(我感到心中七上八下的).

6. _______________(外科医生对急诊的反应) that best shows whether or not he is experienced.

7. _________________(许多人对政府保护环境的运动拍手称好), saying it was the right thing to do.

8. The classroom was almost empty; ________(除一人外其他学生都已做完试卷离场了).

9. ____________(不要对你的问题拖延不管). Try to resolve them.

10. ____________(我们处于一种错觉之中) that we are safe and secure, at least in

our homes.

11. ______________(根据最近的研究), human beings are immune to this disease.

12. If they do not listen to us, ________(他们必定青年人败).

6 Fill in each of the following blanks with a word from the following list. Change the form where necessary.

Bother latter criticism tend

Matter personal message commit

hesitate gift come accept unaware

Requirement indication against

Compliment anxious performance act

Face honesty express promote

Shortly before Abraham Lincoln left Springfield to be the President of the United States, he sent a (__1__) to a clothing merchant(商人) in Boston, thanking him for the "valuable" overcoat the (__2__) had given him as a New Year's (__3__)

There was no suggestion that Lincoln had (__4__) to accept the gift. Nor was there any (__5__) that Lincoln was troubled by possible (__6__) from the public for (__7__) valuable gifts. On the contrary (相反地), evidence (__8__) to show that Lincoln looked upon gifts from citizens(公民) as a (__9__) to him and to his office as President. And no (__10__) how busy he was, he always took time to write to those who gave the gifts and (__11__) thanks to them. Though the new President was (__12__) that those who assisted him in the (__13__) of government duties should keep high standards of decency and (__14__), the morality of accepting gifts does not seem to (__15__) him.

However, as a man deeply (__16__) to honesty and decency in government, Lincoln was not (__17__) of the question of public morality. He (__18__) it and dealt with it as a realist(现实主义者) and a politician. He was not (__19__ ) using power to strengthen his own party. But when it (__20__) to using power for (__21__) gains, Lincoln was firm. The (__22__) he set for himself and for other public officials was always to (__23__) in a way that would (__24__) the public interest.

7 Translate the following into English:

1.你可曾预见到你现在遇到的困难?

2.病人最初知道她患难与共癌症时非常紧张,现在她安静些了,似乎学会了接受恐惧.

3.过去某个时候他一定犯了一个使他至今仍后悔不已的大错,但他从不细说,也没人知道究竟是.个什么错.

4.这都是无事瞎忙,你为何不把时间用得更有意义(meaningful) 些呢?

5.见了广告我几乎不由自主地要步入饭店,但我想起了钱是要用来买教材的,便止步并转身离开.

6.他们终于得出结论,经改善环境他们道德需要清扫他们的城市.

7.作为首席住院外科医生,他不再害怕作生果决策,虽然他承认有时他仍然因疑惑不定而感困扰.

8.校长为人和蔼友善,但一涉及正经理他便对我们就事论事不讲感情,甚至会很严厉.

TEST YOURSELF

Test Paper

(for UNIT1-UNIT5)

(to be finished within 90 minutes)

PART I Vocabulary(30%)

Section A

Directions: Complete each of the following sentences with the correct form of the italicized word on the left of each sentence.

1. lock I lost my keys and couldn't ____ the box.

2. mystery No one knows where he came from. There is something ____ about his family background.

3. experience Mary was already an _____ primary school teacher at the age of 25.

4. survive His ____ is still uncertain; he has been very badly hurt and may die.

5. practice Your suggestion is a good one, but there are some ____ difficulties in our workshop.

6. threat Their lives were frequently ____ by gas explosion.

7. energy Everyone looked fresh and ____ after the three-day spring break.

8. perform The first American ____ of this opera was in 1926.

9. courage It was ____ of Mr. Stone to try and save the drowning man.

10. fortune The boy is ____ to have had the help and guidance of such a learned uncle.

Section B

Directions: For each of the following blanks, four choices are given. Choose the most appropriate one.

11. Don't ___ to let me know if there is anything I can do for you.

A. reject

B. prevent

C. hesitate

D. refuse

12. Let's hang up some paintings on these ____ walls

A. bare

B. empty

C. blank

D. vacant

13. At the conference he expressed some personal views which later brought him into ____ with the Party leadership.

A. action

B. crisis

C. conflict

D. power

14. They have developed techniques which are ____ to those used in most factories.

A. more talented

B. better

C. greater

D. superior

15. Man must stop ____ the earth's atmosphere.

A. filling

B. emitting

C. polluting

D. wasting

16. No one has yet succeeded in explaining the ____ of how life began.

A. problem

B. cause

C. puzzle

D. logic

17. Unfortunately, very few sheep ____ the severe winter last year.

A. survived

B. endured

C. spent

D. remained alive

18. They discussed the problem three or four times, but could come to no ____ .

A. end

B. conclusion

C. a solution

D. a method

19. Well, let's put our heads together and find ____ to the problem.

A. an answer

B. a way

C. a solution

D. a method

20. The old couple decided to move out of town to a quiet ____ , where they had spent several years immediately after their marriage.

A. space

B. suburb

C. neighborhood

D. area

Section C

Directions: For each of the underlined words or phrases, four choices are given. Choose the one that best explains or defines the underlined part.

21. It took Jane a whole hour to solve this algebra problem.

A. work at

B. work on

C. work out

D. work over

22. His manner was so bright and pleasant that Arthur felt at ease with him at once.

A. easy

B. comfortable

C. confident

D. at rest

23. The market was full of salted fish, giving off the worst smell that you can imagine.

A. sending out

B. sending off

C. sending up

D. sending down

24. The self-important manager didn't seem to attach much importance to my advice.

A. apply

B. consider

C. judge

D. give

25. By then our experiment had reached a vital stage.

A. a profound

B. an ultimate

C. a perpetual

D. a very important

26. The British naturalist went all the way to India so that he could obtain firsthand information about the cobra.

A. find

B. get

C. search

D. learn

27. The bridge club rejected his application for membership.

A. refused to consider

B. refused to use

C. refused to give

D. refused to believe

28. The world market is constantly changing. We must anticipate the changes and make timely adjustments.

A. regularly

B. steadily

C. scarcely

D. always

29. He talked in detail about the feasibility of setting up an experimental school in which each child works at his or her own pace.

A. ease

B. suitability

C. practicability

D. possibility

30. Icy roads and poor visibility(能见度) are familiar hazards in the Midwest.

A. chances

B. Dangers

C. Conditions

D. happenings

PART II Structure (20%)

Section A

Directions: Each of the following sentences is incomplete and followed by four choices. Choose the ONE that best completes the sentence.

31. They overcame all the difficulties and fulfilled the plan ten days ahead of schedule, ___ was something we had not expected.

A. that

B. this

C. It

D. which

32. Bob tried in vain to trick his little brother _____ some money from their mother's purse.

A. to steal

B. to stealing

C. into steal

D. into stealing

33. I was ____ to find his article on such an ____ topic so ____ .

A. surprised, excited, bored

B. surprising, exciting, boring

C. surprised, exciting, boring

D. surprising, excited, bored

34. It was in 1777 ____ Vermont, threatened with invasion, declared itself an independent commonwealth.

A. when

B. that

C. in which

D. which

35. ____ a professor of physics at Massachusetts Institute of Technology, Edward Charles Pickering established the first physics laboratory in the United States.

A. while

B. being

C. although

D. he was

36. He didn't ____ and so he failed the examination.

A. work enough hard

B. work hard enough

C. hard work enough

D. hard enough work

37. The two boys had so _____ in common that they soon became good friends.

A. little

B. few

C. much

D. many

38. As fuel prices rose, bus companies raised their fares(票价) and ____ .

A. so did the airlines(航空公司)

B. nor did the airlines

C. so the airlines did

D. nor the airlines did

39. _____ mainly for the invention of the telephone, Alexander Graham Bell devoted his life to helping the deaf.

A. he is remembered

B. to remember

C. while remembering

D. though remembered

40. If Dorothy had not been badly hurt in a car accident, ____ in last month's marathon race.

A. she would participate(参加)

B. she might participate

C. she would have participated

D. she must have participated

Section B

Directions: Each of the following sentences has four parts underlined and marked A, B, C and D. you are to identify the ONE that needs correction.

41. Mary (said to)A her husband that she didn't (feel like to go to)B to (the movies)C that night because she was (tired out)D after a day's work.

42. Jacks mother (has to)A call him at least (half a dozen)B times (until)C he (comes down)D to his dinner.

43. A (red-hair)A boy (is needed)B to play (part of Alfred)C in (this)D new play.

44. Neither John (or)A his father (was)B able (to wake up)C early enough (to catch)D the morning train.

45. Wilson was (surprised)A to find that there was only one (other)B guest (except)C (himself)D.

46. (they say)A Mexico City is (more populous)B (人口稠密的) than (any city)C in (the world)D.

47. (The atmosphere i)A (is consisted)B of certain gases (mixed together)C (in)D definite proportions.

48. We were pleased to have the opportunity to watch (such talented dancers)A (to perform)B (a)C (highly)D acclaimed(受到赞扬的) new ballet.

49. (During)A that terrible snowstorm, the police (demanded)B that people (stayed off)C Highway 101 (except)D in cases of emergency.

50. The colonel (realized)A that the private (was crying)B (because)C what he (had said)D.

PART III Cloze (10%)

Directions: Fill in each of the numbered blanks with the best of the four choices given.

When my wife, who is Spanish, spent her first winter in London a few years ago, she used to ask me time and again: "Where's the fog?" Almost all foreigners (__51__) to find the city wreathed (萦绕) in yellow-grey mist(薄雾) for most of the year. Dickens, who was (__52__) responsible for painting this (__53__) in people's minds, certainly wasn't exaggerating in those days. People (__54__) in the nineteenth century that when someone (__55__) suicide by jumping into the Thames he was choked(窒息) by the fog and poisoned by the terrible (__56__) of the river before he had time to drown himself. In fact, the situation(__57__) in recent years. When I was a boy in London thirty years ago I was often unable to see (__58__) of the road when I left home on winter mornings.

The decisive steps that have turned London into one of the (__59__) cities in the world(__60__) taken at the end of the 1950s. But Londoners still (__61__) that fog (__62__) returns. The change took place as a result of two main improvements. Factories were compelled(被迫) to install(安装) clean air equipment (__63__) close down, and private householders were not allowed to(__64__) coal unless it was smoke-free. But the (__65__) ecological(生态的) miracle(奇迹)in London occurred(出现) ____ (__66__) 1964 onwards when the Thames Water Authority began to pump vast (__67__) of dissolved oxygen into the river. (__68__), all the species of fish that had gradually disappeared from the Thames (__69__) 1800 have returned. Some are even

caught by fishermen (__70__) the House of Parliament(议会大厦).

51. A. look forward B. manage C. wish D. expect

52. A. first of all B. above all C. after all D. all the more

53. A. picture B. image C. photo D. portrait

54. A. were used to saying B. used to saying C. were used to say D. used to say

55. A. made B. committed C. did D. was committed

56. A. fume B. smell C. smoke D. gas

57. A. only has changed B. only changes C. has only changed D. changed only

58. A. other side B. another side C. the other side D. along side

59. A. clean B. cleaner C. cleanest D. more clean

60. A. was B. were C. have been D. had been

61. A. find it strange B. find out strange

C. find strange

D. find out it strange

62. A. hardly B. barely C. scarcely D. seldom

63. A. and B. but C. to D. or

64. A. use B. make C. produce D. burn

65. A. true B. truly C. real D. really

66. A. in B. from C. on D. through

67. A. numbers B. number C .amount D. quantities

68. A. therefore B. nevertheless C. however D. as a result

69. A. before B. since C. after D. since

70. A. outside B. in the front of C. inside D. beside

PART IV Reading Comprehension (20%)

Directions: in this part there are three passages followed by twenty questions, each with four suggested answers. Choose the ONE that you think is the best answer.

Passage 1

The qualities of leadership are almost constant the world over. If you would like to become president of your class, school, or student council, you must first demonstrate that you have the potentials of leadership.

For one thing, you must show that you are interested in your school and in your fellow students. In practical terms, this means taking an active part in school activities.

It means joining clubs, attending dances and other social functions, and going out for athletics - if you are athletic. (1)But many young people have to push themselves to join clubs or attend dances, Perhaps you are one of them. The basic reason for this hesitancy is natural shyness. There is nothing whatever wrong with shyness; it can be overcome if you recognize that it is not a permanent affliction(苦恼), and if you realize, too, that most of your schoolmates are probably as shy as you are.

If you consciously strive(努力) to overcome shyness by going out to meet people, you will find yourself at the same time developing another quality of leadership-understanding. As your circle of friends and contacts widens you will get to know your schoolmates better. Because you are no longer so concerned with your own feelings, you will begin to respect and take into account the feelings of others. Your friends and acquaintances(熟人) will be aware of your new attitude, for it will show in many small ways - your greeting, conversation, and willingness to give and accept friendship.

Another quality of leadership which you can develop is willingness to do a bit extra. If you are expected to sell ten tickets to a dance, for example, and sell fifteen, you have proved your interest and your effort to make your organization successful. Once you acquire(获得) the reputation(名声) of always doing a little more than expected, your fellow students will be willing to trust you with greater responsibilities. All your extra effort also indicates enthusiasm, and shows that you concentrate more on how to do a job efficiently than on its difficulties.

A fourth quality of leadership is imagination - the ability to see a way through problems and to develop new ideas. You can develop this all - important quality by devoting extra thought during quiet moments to problems being faced by your organization. Many members of a club sit passively through a meeting, and give no more thought to club matters until the next meeting. But if you take time during the week to think over the last meeting, you are likely to come up with new ideas (or at least some questions) to contribute at the next meeting.

As you show that you are interested in your school or organization, that you have understanding and respect for your schoolmates, and that you will work hard and use your imagination, your schoolmates will naturally think of you as one of their leaders.(2) When the time comes for election of class or student body officers, you will be mentioned as a possible candidate by your closer friends, and this word will

reach other groups until you are given a chance to declare yourself a candidate without seeming immodest.

71. This article

A. discusses how a person can develop qualities of leadership.

B. indicates various ways a good leader can make friends and influence people.

C. analyzes the responsibilities of leadership.

D. explains why many people are not good leaders.

72. The author feels that a prospective leader should attend school dances to

A. prove that he is the best dancer in the school.

B. show his interest in school activities.

C. overcome his shyness.

D. learn how to dance.

73. The author apparently feels that a person who is not athletic

A. should go out for athletics anyway.

B. is definitely not interested in school elections.

C. has no chance of becoming a leader.

D. can participate in other school activities.

74. The author thinks that understanding of others leads to

A. respect for others.

B. willingness to do a bit extra.

C. overcoming one's shyness.

D. understanding of one's own feelings.

75. The author feels that

A. a person is born with imagination.

B. imagination can be developed.

C. some people have no imagination.

D. imagination prevents one from thinking hard.

76. In the sentence "The basic reason for this hesitancy is natural shyness." The word "hesitancy" means.

A. willingness.

B. reluctance.

C. embarrassment.

D. indecision.

77. According to this article, if you want to be class president, you should

A. engage in school politics.

B. have a group of close friends.

C. show that you have the qualities of leadership.

D. attend class meetings regularly.

78. This analysis is a

A. cause-and-effect discussion of the outcome of school elections.

B. point-by-point explanation of how to develop the qualities of leadership.

C. comparison of good leaders and bad leaders.

D. close examination of the good points of the president of student council.

Passage 2

"Wars of the next century will be fought over water." This latest warning comes from the World Bank, the largest international investor(投资者) in water projects. So is the world running out of the stuff? No. The total quantity of fresh water on the Earth exceeds all possible human needs. (3)But tell that to the government of Jordan, which has drawn its underground water almost dry since Israel diverted(使改道) much of its largest water source, the river Jordan. Or to the millions of women in the African countryside walking for hours every day to collect water from polluted wells and muddy(多烂泥的) river beds.

(4)The answer is that there is no world water crisis but many severe local water crises. There are crises of underinvestment, of political conflict over rivers that cross national boundaries(分界线), and of plain idiotic water management.

The Middle East is the likeliest place for future water wars. A long-term settlement between Israel and its neighbors will depend at least as much on fair allocation(分配) of water as of land. Iraq and Syria watch and wait as Turkey builds dams(坝) in the headwaters of the Euphrates. Elsewhere, India angers Bangladesh by diverting to its fields the thin dry-season flow of the Ganges.

Meanwhile, the best places for dams are mostly used up. Engineering and environmental costs of developing new water sources will be much higher than in the past. The human costs too are great. 16 Million people have lost their homes and land to man-made lakes in India. China will have to move one million people to make way for the There

Gorges dam on the Yangtze, on which construction work began this year.

But the solution to the world's water crisis lies less in supply than in demand. The bank has spent half a century building dams, but the water problem in most countries results mainly from inefficient use of water.

Israeli scientists have long since understood this. They have revolutionized their country's use of water, cutting out much of the waste in watering crops, which in many countries accounts for 90% of water use. Waste takes other forms. Most city supply systems leak 30-50% of their water underground. And most urban sewage(污水) - a vast potential source of recycled water - passes untreated into rivers. In most countries, water is delivered at prices that reflect only a small part of the real cost. The World Bank is now calling for proper water pricing. The time is coming when water must be treated as a valuable resource, like oil, not a free one like air.

79. According to the passage, what will be the probable cause of wars in the next century?

A. Food

B. Oil.

C. Land.

D. Water.

80. The world's total fresh water supply

A. is more than adequate for human needs.

B. falls short of human demands.

C. is likely to run out in the next century.

D. can't be renewed once it is used up.

81. Which of the following statements is true?

A. there is a world water crisis.

B. there is great improvement in the fresh water supply.

C. there is local fresh water shortage.

D. there is no way to solve the present water problems.

82. According to the passage, future water wars will most probably break out

A. between India and Bangladesh.

B. in the Middle East.

C. between Iraq and Syria.

D. wherever there is shortage of water.

83. According to the author, peace between Israel and its neighbors will not come unless

A. the water problem is solved.

B. the UN takes part in the talks.

C. the USA acts as the peace maker.

D. all Arab countries join in the peace talks.

84. The chief solution to the water crisis is

A. developing new fresh water sources.

B. building more dams.

C. cooperation among nations.

D. efficient use of water.

85. According to the passage, the price of water should be

A. lowered.

B. kept stable

C. raised

D. kept at the same level as oil price.

Passage 3

At sixteen Ron Mackie might have stayed at school, but the future called to him excitedly. "Get out of the classroom into a job," it said, and Ron obeyed. His father, supporting the decision, found a place for him in a supermarket. "You're lucky, Ron," he said. "For every boy with a job these days, there's a dozen with-out." So Ron joined the working world at twenty pounds a week.

For a year he spent his days filling shelves with tins of food. (5)By the end of that time he was looking back on his school-days as a time of great variety(多样性) and satisfaction. He searched for an interest in his work, with little success. One fine day instead of going to work Ron got a lift on a lorry (卡车) going south. With nine pounds in his pocket, a full heart and a great longing for the sea, he set out to make a better way for himself. That evening, in Bournemouth, he had a sandwich and a drink in a café run by an elderly man and his wife. Before he had finished the sandwich, the woman had taken him on for the rest of the summer, at twenty pounds a week, a room upstairs and three meals a day. The ease and speed of it rather took Ron's breath away. At quiet times Ron had to check the old man's arithmetic in the records of the business.

At the end of the season, he stayed on the coast. He was again surprised how straightforward it was for a boy of seventeen to make a living. He worked in shops mostly, but once he took a job in a hotel for three weeks. Late in October he was

西安电子科技大学 数字电路基础 答案

习题4 4-3 解:该电路的输入为3x 2x 1x 0x ,输出为3Y 2Y 1Y 0Y 。真值表如下: 由此可得:1M =当时,33 2 321210 10 Y x Y x x Y x x Y x x =??=⊕?? =⊕??=⊕? 完成二进制至格雷码的转换。 0M =当时,33 2 32 132121 321010 Y x Y x x Y x x x Y x Y x x x x Y x =??=⊕?? =⊕⊕=⊕??=⊕⊕⊕=⊕? 完成格雷码至二进制的转换。

4-9 设计一个全加(减)器,其输入为A,B,C 和X(当X =0时,实现加法运算;当X =1时,实现减法运算),输出为S(表示和或差),P (表示进位或借位)。列出真值表,试用3个异或门和3个与非门实现该电路,画出逻辑电路图。 解:根据全加器和全减器的原理,我们可以作出如下的真值表: 由真值表可以画出卡诺图,由卡诺图得出逻辑表达式,并画出逻辑电路图: A B C X P 4-10 设计一个交通灯故障检测电路,要求红,黄,绿三个灯仅有一个灯亮时,输出F =0;

若无灯亮或有两个以上的灯亮,则均为故障,输出F =1。试用最少的非门和与非门实现该电路。要求列出真值表,化简逻辑函数,并指出所有74系列器件的型号。 解:根据题意,我们可以列出真值表如下: 对上述的真值表可以作出卡诺图,由卡诺图我们可以得出以下的逻辑函数: F AB AC BC A B C AB AC BC A B C =+++=??? 逻辑电路图如下所示: A F 4-13 试用一片3-8译码器和少量逻辑门设计下列多地址输入的译码电路。 (1) 有8根地址输入线7A ~1A ,要求当地址码为A8H,A9H ,…,AFH 时,译码器输出为 0Y ~7Y 分别被译中,且地电平有效。 (2) 有10根地址输入线9A ~0A ,要求当地址码为2E0H,2E1H, …,2E7H 时,译码器输 出0Y ~7Y 分别被译中,且地电平有效。

2012年下半年大学英语三第二次作业

大学英语(三)(19000003) > 课程作业> 复查测验:2012年下半年大学英语三第二次作业 复查测验:2012年下半年大学英语三第二次作业 用户2012秋入学专升本 已提交12-10-17 下午11:22 名称2012年下半年大学英语三第二次作业 状态已完成 分数得94 分,满分100 分 说明 问题1得3 分,满分3 分 一、交际英语(每题3分,共30分) 1、- Good-bye for now. - _________ 所选答案: C. See you. 问题2得3 分,满分3 分 2、- How do I get to the cinema? - _________ 所选答案: D. Go down this street and turn left. 问题3得3 分,满分3 分 3、— Hi, Tom, how's everything with you? — , and how are you? 所选答案: B. Hm, not too bad. 问题4得3 分,满分3 分 4、- Wow! This is a marvelous room! I've never known you're so artistic.

- ______ 所选答案: C. Thanks for your compliments. 问题5得3 分,满分3 分 5、–How was your trip to London, Jane? – _____________________ 所选答案: A. Oh, wonderful indeed. 问题6得3 分,满分3 分 6、–Oh, sorry to bother you. –__________________. 所选答案: A. That’s Okay. 问题7得3 分,满分3 分 7、--Excuse me, could you tell me how to get to the post office? -- _____________. 所选答案: D. Sorry, but I am a stranger here myself 问题8得3 分,满分3 分 8、- Could you help me with my physics, please? - ________ 所选答案: D. Sorry I can't. I have to go to a meeting right now. 问题9得3 分,满分3 分 9、-- Congratulations! You won the first prize in today's speech contest. -- ________ 所选答案: C. Thank you. 问题10得3 分,满分3 分 10、- Do you mind my smoking here? - _______

马克思主义基本原理概论-北师大-网络教育-作业三-答案

马克思主义基本原理概论_北师大_网络教育_作业三_答案 商业资本的职能是执行的产业资本循环中(商品资本的职能)。 在资本主义条件下,股票持有者获得的股息实质上是(雇佣工人创造的剩余价值)。余价值转化为资本就是(资本积累)。 货币资本、生产资本和商品资本是(产业资本循环中的三种职能形式)。 资本的周转时间是指(生产时间和流通时间)。 年剩余价值量用公式表示就是(m'v n)。 社会总产品的价值补偿和实物补偿是(考察社会资本再生产的核心问题)。 相互联系相互依存的个别资本的总和是(社会资本)。 垄断价格是凭借垄断地位规定的市场价格,它(改变了价值规律的表现形式)。金融寡头在经济上统治地位的实现主要是通过(参与制)。 1、商品的价值由什么决定? 劳动力商品的价值 由生产和再生产劳动力商品的社会必要劳动时间决定 由维持劳动者生存和发展所必需的生活资料价值决定。 劳动力商品的使用价值是价值的源泉,它的使用能够创造新价值,而且是比自身 价值更大的价值。 2、什么是固定资本?什么是流动资本?其划分依据是什么? 固定资本就是不变资本,流动资本就是可变资本。 在资本主义制度下,资本的本质不是物,而是体现在物上的资本主义生产关系,即被物的外壳所掩盖的资产阶级同无产阶级之间剥削与被剥削的生产关系。资本 在生产过程中以两种形式存在:生产资料形式和劳动力形式。根据这两部分资本

在剩余价值生产中所起的作用不同,把资本划分为不变资本和可变资本。 不变资本和可变资本的划分,是马克思的重要理论贡献,它的意义在于:第一,进一步揭露了剩余价值的源泉和资本主义剥削的实质。通过区分不变资本和可变资本,说明剩余价值不是有全部资本产生的,不是有不变资本产生的,而是由可变资本产生的,工人的剩余价值是剩余价值的唯一源泉。第二,它为揭示资本家对工人的剥削提供了科学依据,正确的表明了资本主义剥削程度的是剩余价值率。 3、垄断是怎样形成的?垄断组织都有哪些形式? 答:垄断是指一个或者几个大型企业占有一个经济部门的全部或绝大部分的生产或流通份额,并因此达成协议,垄断该部门的生产或流通,控制相关商品的价格,从而获取高额垄断利润的情况。垄断是从自由竞争开始的,在自由竞争资本主义阶段,社会从事生产和流通活动的经济主体,主要是私人资本家所有的资本主义企业,各个企业不断通过资本积聚和集中扩大规模,在市场的激烈竞争中抢占优势。当生产和资本集中发展到一定程度时,就会走向垄断。因为当一个部门的大部分生产或流通为一个或几个大企业所控制时,竞争对手之间势均力敌,继续竞争可能会两败俱伤,它们必然会放弃竞争,通过协商达成协议形成垄断,并能坐享垄断带来的高额利润。 垄断组织是指若干个资本主义大企业,联合起来操纵和控制某一部门或几个部门绝大多数产品和销售及原料市场,以保证获得高额垄断利润的组织。最初的垄断组织形式是一些临时的、短期的垄断协议。现在的主要垄断组织形式有卡特尔、辛迪加、托拉斯和康采恩。但无论是那种垄断组织形式,其实质都是垄断资本家通过垄断生产和市场,更多地榨取劳动者的血汗,以获取高额利润的工具。

11、武大研究生英语期末考试英译汉重点句子

Unit one Stumbling block in intercultural communication 1 在这个国际舞台发生重大变化的时刻,探讨为什么尝试交流的结果却令人失望的原因是必要的,这些原因实际上是跨文化交流中的绊脚石。 It’s appropriate at this time of major changes in the international scene to take a look at some of the disappointing results of attempts at communication. They are actually stumbling block in international communication. 7 本国居民可能会被灌输有这种期望:既然外国人穿着合适,并且能说一些本国话,那么他或她也有同样的非语言的准则、想法和感觉。 The native inhabitants are likely to be lulled into the expectation that ,since the foreign person is dressed appropriately and speak some of the language,he or she will also have similar nonverbal codes ,thoughts and feelings. 8 更糟糕的问题是死死抱住新语言中一个词汇或短语的一种意义,而不顾隐含义和语境。 A worse language problem is the tenacity with which someone will cling to just one meaning of a word or phrase in the new language, regardless of connotation or context. 11 先入为主和程式化思维的现象

大学英语(3)第二次作业题及答案.doc

第2次作业 一、阅读理解(本大题共100分,共5小题,每小题20分) 1. Prehistoric men and women enjoyed a more varied diet than people do now, since they ate species of plant and several hundreds thousands types of living things. But only a tiny percentage of these were ever domesticated. Modern shops have hastened a trend towards specialization which began in the earliest days of agriculture. The food of the rich countries has become cheaper relative to wages. It is speedily distributed in supermarkets. But the choice annually becomes less and less great. Even individual foods themselves become more standardized. We live in the world of carrot specially blunted in order to avoid making a hole in the bag, and the tomato grown to meet a demand for a standard weight of weighting tomatoes to a kilo. Siri von Reis asks: "Only the three major cereals (谷物类食物)and perhaps ten other widely cultivated species stand between famine and survival for the world" s human population and a handful of drug plants has served Western civilization for several thousand years. A rather obvious question arises: Are we missing something?” After all, there are 800 000 species of plant on earth. (1). Tn prehistoric times people. A.ate much more than we do today B.lived mainly on plant food C.had a wide-ranging diet D.were more fussy about what they ate (2). Most of us have come to expect A. no variation in our diet B. a reduction in food supplies C. a specialist diet D. food conforming to a set standard (3). The specialization of food was started by

北师大网络教育《网络实验》在线作业

1. 关于IP地址10.0.0.1,下列叙述正确的是(C)。 A. 它是一个E类地址 B. 它是一个公网地址 C. 它是一个私网地址 D. 它是一个B类地址 2. ARP –d命令的作用是( A )。 A.删除缓存中的所有映射项目。 B.查看缓存中的所有映射项目。 C.删除某IP映射的项目。 D.向缓存输入一个静态项目。 3. 下面是某三层交换机的部分配置( B ) SW1(config)#ip route 0.0.0.0 0.0.0.0 192.168.10.254 SW1(config)#router ospf 100 SW1(config-router)#default-information originate 则default-information originate的意义是____ 。 A.在SW1上产生默认路由 B.将Sw1上配置的默认路由转递到ospf域中 C.重置ospf的初始信息 D.这个命令可以去掉,对配置不产生影响 4. 100Base-T以太网的最大网段距离是(D)。 A.185米 B.500米 C.200米 D.100米 5. SMTP通过TCP/IP协议在客户机和服务器之间建立一个(C)

连接。 A.UDP B.ARP C.TCP D.RARP 6. 网络中PC机与集线器相联所使用的网线接头类型为(A) A.RJ-45 B.RJ-11 C.RJ48 D.RJ12 7. TCP滑动窗口的作用是(A)。 A.流量控制。 B.拥塞控制。 C.路由控制。 D.差错控制。 8. FTP Client发起对FTP Server的连接建立的第一阶段建立 (D)。 A.传输连接 B.数据连接 C.文件名 D.控制连接 9. 1000BaseT中T指的是(C) A.细缆 B.粗缆 C.双绞线 D.光缆 10. UDP协议报头长度是(A) A 8字节 B20字节 C60字节 D64字节 11. OSI参考模型包含了(D)层。 A4 B5 C6 D7 12. 基带系统使用(C)进行传输的。 A.模拟信号 B.调制信号 C.数字信号 D.载波信号 13. 在TCP/IP网络中,为各种公共服务保留的端口号范围是(C)。

北京师范大学专科大学英语一作业3及答案

北京师范大学专科大学英语一作业3及答案

一、单选题(共 40 道试题,共 80 分。) V 1. The clock ()10 when I got up this morning. A. told B. said C. read D. spoke 满分:2 分 2. His constant ()with his peers(同龄人) has left its mark on his growth. A. consent B. contract C. context D. contact 满分:2 分 3. The house()roof is blue has just been finished. A. whose B. which C. that D. whom 满分:2 分 4. Some people argue that ()regulations(规章制度) for water pollution will drive up costs and put jobs at risk. A. firm B. tight C. tense D. close 满分:2 分 5. They ( ) me by asking so many questions at the same time. A. forced B. included C. offered D. confused 满分:2 分 6. The elderly man is quite (). A. young B. old

A. right away B. by the way C. at last D. in that case 满分:2 分 14. How many ()are there in the picture? A. woman B. women C. buy D. milk 满分:2 分 15. We will double the number of Safer Cities Schemes to cover 40 ()areas. A. industrial B. remote C. rural D. urban 满分:2 分 16. Can you ()an insect having eight eyes and still having poor eyesight? A. imagine B. suppose C. think D. expect 满分:2 分 17. You’ll soon get used to ()in the country. A. live B. living C. to live D. lived 满分:2 分 18. The company is starting a new advertising campaign(广告战) to()new customers to its stores. A. join B. attract C. stick D. transfer 满分:2 分 19. Our company’s service is ()in nearly 50 countries around the world. A. available B. careful C. natural

2019年春季学期课程作业大学英语lxh第二次作业

正在加载试题,请稍候... 2019年春季学期课程作业大学英语(3)第2次 大学英语(3) 题号一二三四五合计 已做/题量0 / 15 0 / 3 0 / 3 0 / 5 0 / 1 0 / 27 得分/分值0 / 30 0 / 15 0 / 15 0 / 25 0 / 15 0 / 100 一、单项选择题(共15 题、0 / 30 分) 1、 ( We have a high regard for Prof. Joseph because he always____ his principles. A、lives on B、lives up to C、 lives down D、lives with : 2、 After months of voyage, Columbus arrived in ____ later proved a new continent. A、where B、which C、what , D、that 3、 Even if his letter____ tomorrow, it____ too late to do anything. A、 will arrive...is B、 should arrive...were ;

arrives...will be D、 arrives...would be 4、The trouble ()the car is that it has to be repaired every few days. A、A to { B、B for C、C in D、D with 5、 If you want to gain people’s res pect, be sure to _____ your promises. | A、live through B、live up to C、live with D、live on 6、–Hello, I’m David Chen. Nice to meet you. -- ( ) 、 A、Are you B、Nice to meet you too. C、Yes. D、Very nice. 7、 As the saying goes, all work and no play makes Jack a dull boy. So we should ____ work and play.、

北师大网络教育《微积分(上)》作业

《线性代数》作业 本课程作业由二部分组成:第一部分为“客观题部分”,由15个选择题组成,每题1分,共15分; 第二部分为“主观题部分”,由4个解答题组成,第1、2题每题2.5分,第3、4题每题5分,共15分。作业总分30分,将作为平时成绩记入课程总成绩。 客观题部分 一、选择题(每题1分,共15分) 1.三阶行列式031 042142 --的值为( D ) A 、1 ; B 、-1 ; C 、-2 ; D 、2 2. n 阶行列式112 23100000000000000n n n n nn a a a a a a a -?? ? ? ? ? ? ?? ? 的值为( C ) A 、1a 2a 1n a - n a ; B 、-1a 2a 1n a - n a C 、(-1)n+1 1a 2a 1n a - n a ; D 、0 3.2n a b a b a b D c d c d c d =的值为( B )。 A 、()n ab cd -; B 、()n ad bc - ; C 、()2n ad bc - ; D 、()2n ab cd - 。 4.若A 为n 阶可逆方阵,且 |A|=a ,则 1||kA - =( B )

A 、1k a -; B 、1n k a -; C 、n ka -; D 、1 k a -+ 5.设A 为n 阶方阵,且A =3,则1kA -=( B ) A 、13k - ; B 、13n k - ; C 、3a ; D 、3n k 6.设A 为n 阶不可逆方阵,则( A ) A 、A =0 ; B 、A =0 ; C 、Ax =0只有零解; D 、A I +必为可逆方阵 7.设A ,B 为同阶对称矩阵,则( B )不一定是对称矩阵。 A 、A - B 对称; B 、AB 对称 ; C 、'A B +对称 ; D 、'A B +对称 8.向量组1a =(-1,-1,1),2a =(2,1,0),3a =(1,0,1),的秩是( C ) A 、0 ; B 、1 ; C 、2 ; D 、3 9.设A ,B 均为n 阶可逆方阵,则( A ) A 111()A B B A ---= B 、111()A B A B ----=- C 、111()A B A B ---+=+ D 、11()kA kA --= 10.若齐次线性方程组系数矩阵的秩等于未知数个数,则改方程组( A ) A 、有唯一解 B 、无解 C 、有无穷多组解 D 、不一定有解 11.两个矩阵的特征多项式相同是这两个矩阵相似的( B ) A 、充分不必要条件; B 、必要不充分条件; C 、充要条件; D 、不充分也不必要条件。 12.设1a ,…,n a 是n 元线性方程组AX =0的基础解系,则( D ) A 、1a ,…,n a 线性相关 B 、n =s -r (A ) C 、AX =0的任意s -1个解向量线性相关 D 、AX =0的任意s +1个解向量线性相关 13.已知1β,2β是非齐次线性方程组AX =b 的两个不同的解,1η,2η是对应齐次线性方

西安电子科技大学《电路基础》第三章部分习题解

习题三 3.3如题图3.3所示,求电压u,如果独立电压源的均值增至原值的2倍,独立电流源的值降为原值的一半,电压u变为多少? Ω3 1 i A Ω 2 V1 图3.3 解:仅考虑电压源(电流源开路) Ω3 1 i Ω 2 V1 对节点a列写节点方程 (1/3+1/6) a u=1/3+10/6 所以 a u=4V 3 1 i+1=4 则1i=1A 1 u+4?2+(-1)+3?(-1)=0 则1u=-4V 仅考虑电流源(电压源短路) Ω3 1 i Ω 2

1i =3?2/3=2A i =4-21i =1A 2u +4?1-3?2-2?3=0 故 2u =8V 所以 u =1u +2u =4V 当电压源增至2倍时,电流源降为原来的一半时,V u u 8211-==' V u u 421 22==' ='∴u V u u 421-=' +' 3.4如题图3.4所示电路,N 为不含独立源的线性电路,已知当s u =12V ,s i =4A 时,u =0V ;当s u =-12V ,s i =-2A 时,u =-1V ;求当s u =9V ,s i =-1A 时的电压u 。 s u 图3.4 解:u =1k s u +2k s i 根据题意列方程有: 121k +42k =0 -121k -22k =-1 解之有: 1k =1/6 2k =-1/2 即 u =1/6s u -1/2s i 故当s u =9V ,s i =-1A 时,u =2V 3.5当开关s 位置在1时,I =40mA,s 在位置2时,I =-60mA ,求s 在位置3时,I =?

V 图3.5 解:当开关s 位置在2时,电路图可以看成下图的叠加 V 4 所以,I '=I =40mA I ''=k 1s u I =I '+I ''=40mA+k 1s u =-60mA 所以k 1s u =-100mA 同理,若s 在位置3 I =I '+I ''=40mA+k 2s u 2 3 4621-=-=∴ s s u u k 2s u =150mA 故 I =190mA 3.8 N 为不含独立源的线性电阻电路,输出电压u =1/2s u ;若数处端 接5Ω电阻,u =1/3s u 问:输出端接3Ω电阻时,u 与s u 的关系。 +- u 图3.8 解:根据戴维南定理,电路等效为电压源和电阻串连

川大2017秋冬季《大学英语(三)》第二次作业答案的

川大2017秋冬季《大学英语(三)》第二次作业答案 一、单项选择题。本大题共35个小题,每小题2.5 分,共87.5分。在每小题给出的选项中,只有一项是符合题目要求的。 1. —Can you go to the concert with us this evening? —________________ A.No, I already have plans. B.I’d love to, but I’m busy tonight.√ C.No, I really don’t like being with you. D.I’m ill, so I shouldn’t go out. 2. —Would you like to go skating with me? —________________. A.Yes, I think so B.No, thanks C.Yes, I'd love to√ D.I'm afraid not 3. —What about going for a walk? —________________. A.It’s good for you B.That’s all right C.So, do I D.Why not? A good idea√ 4. —Hello, may I have an appointment with the headmaster? —________________. A.Sorry, I don't know you B.No, you can't C.Certainly. Wait a minute, please√ D.Let me see 5. —May I use your bike for a moment? —________________. A.It’s well. B.It doesn’t matter. C.By all means.√ D.I have no idea. 6. —It’s rather cold in here. Do you mind if I close the window?

2019春大学英语三第二次在线作业

2019春大学英语三第二次在线作业单选题 (共40道题) 1.( 2.5分)– Is it going to rain? -- _________. ?A、Thank you. ?B、I like the rain. ?C、I love sunshine. ?D、I think so. 我的答案:D 此题得分:2.5分 2.(2.5分)– what does the weather forecast say? --___________. ?A、It says I’m fine. ?B、It says it is going to snow. ?C、It says the traffic will turn better. ?D、It says OK. 我的答案:B 此题得分:2.5分 3.(2.5分)– Excuse me, are you free tomorrow evening? --___________. ?A、You’re welcome. ?B、I’m glad to see you. ?C、It doesn’t m atter. ?D、I think so. 我的答案:D 此题得分:2.5分 4.(2.5分)– Do you enjoy your food? --___________. ?A、Thank you. ?B、I’d like a cup of tea. ?C、Yes, they’re delicious.

?D、OK. 我的答案:C 此题得分:2.5分 5.(2.5分)– What can I do for you? --__________. ?A、Hello. ?B、I want to buy this book. ?C、Thank you. ?D、Nice to meet you. 我的答案:B 此题得分:2.5分 6.(2.5分) Iron expands when____ . ?A、heat ?B、hot ?C、heated ?D、is hot 我的答案:C 此题得分:2.5分 7.(2.5分)— What did you think of Bellow’s new book? — I enjoyed ________ it. ?A、to read ?B、reading ?C、to have read ?D、the reading of 我的答案:B 此题得分:2.5分 8.(2.5分)—May I help you with some shoes, sir? — Yes. I’ d lik e to try on those brown __________. ?A、one ?B、ones ?C、two ?D、pair

北京师范大学网络教育离线作业答案

《微积分(上)》作业 本课程作业由二部分组成:第一部分为“客观题部分”,由15个选择题组成,每题1分,共15分; 第二部分为“主观题部分”,由4个解答题组成,第1、2题每题2.5分,第3、4题每题5分,共15分。作业总分30分,将作为平时成绩记入课程总成绩。 客观题部分 一、选择题(每题1分,共15分) 1.设函数()f x 在2x =处可导,且()'22f =,则()()022lim 2h f h f h →+-=( B ) A 、 1 2 B 、1 C 、2 D 、4 2.点0x =是函数()232,0 00sin 2,0 x x f x x x x x ??+? 的( B ) A 、连续点 B 、可去间断点 C 、第二类间断点 D 、第一类间断点但不是可去间断点 3.设()f x 在(),a b 内二次可导,且()()'''0xf x f x -<,则在(),a b 内() 'f x x 是( B ) A 、单调增加 B 、单调减少 C 、有增有减 D 、有界函数 4.当0x →时,下列函数为无穷小量的是( B ) A 、sin x x B 、2sin x x + C 、()1 ln 1x x + D 、21x - 5. 2sin 1lim lim 221x x cosx x x x →∞→∞-==-+,则此计算( C ) A 、正确 B 、错误,因为2lim 1x cosx x →∞+ 不存在 C 、错误,因为2lim 1x cosx x →∞+不是∞∞未定式 D 、错误,因为2lim lim 11x x cosx cosx x x →∞→∞=++ 6.下列关系正确的是( C ) A 、()()d f x dx f x =? B 、()()'f x dx f x =? C 、()()d f x dx f x dx =? D 、()()d f x dx f x C dx =+?

《大学英语(三)》第二次作业答案2017

你的得分:90.0 完成日期:2017年02月5日 17点34分 说明:每道小题选项旁的标识是标准答案。 一、单项选择题。本大题共35个小题,每小题 2.5 分,共87.5分。在每小题给出的选项中,只有一项是符合题目要求的。 1. o—Can you go to the concert with us this evening? o—________________ C.No, I already have plans. D.I’d love to, but I’m busy tonight. E.No, I really don’t like being with you. F.I’m ill, so I shouldn’t go out. o—Would you like to go skating with me? o—________________. B.Yes, I think so C.No, thanks D.Yes, I'd love to E.I'm afraid not o—What about going for a walk? o—________________. B.It’s good for you C.That’s all right D.So, do I E.Why not? A good idea o—Hello, may I have an appointment with the headmaster? o—________________. B.Sorry, I don't know you C.No, you can't D.Certainly. Wait a minute, please E.Let me see o—May I use your bike for a moment? o—________________. B.It’s well. C.It doesn’t matter. D.By all means.

北京师范大学网络教育大学英语三作业三

北京师范大学网络教育大学英语三作业三 What would you like to drink? - _______ . orange juice, please - I'm engaged. - _______ on your engagement. Congratulations - I'd like to make a reservation for two days. My name is Li Ming. - _______Single or double room? - Hello, may I speak to John? -__________Just a second, please. - Thank you for your invitation. - ________.It's a pleasure 第二部分:阅读理解(共10小题;每小题3分,满分30分) It is _______ since a man being operated felt all the pain. few years Long ago, when the sick man was operated on, he _______ . could feel all the pain Using the laughing gas, the people did not seem to _______ . feel pain If a man took less laughing gas than he should have when an operation went on, he _______ . still felt pain One who took too much of the laughing gas _______ . would die Miss Jordan decided to become a lawyer________.when she was in high school What did she study at Boston University? ______.Law The word "restless" in Paragraph5 means in its sentence_______.not satisfied with me life she was living and wanting to have some new experience In her political life she won ________ in 1972. a seat in the U.S. Congress Miss Jordan was the first black woman_________.from the South to be elected to Congress 第三部分:词汇与结构(共5小题;每小题3分,满分15分) Hundreds of people ____their homes in the floods. Lost I don't believe Bush is elected as the President. There ____ some mistake with the vote. must be Had you come here one minute earlier, you ____ the school bus. But now you had to wait for another ten minutes for the next school bus. would have caught Her case has attracted an enormous ____ of public sympathy. Amount Not matter ____, the heavy box is still immoveable. how hard I am pushing 第四部分:完形填空(共10小题;每小题1分,满分10分) American people divide their days 21 several blocks 22 time, and plan different activities 23 different times. American time is "on the dot". If something is supposed to happen 24 eight o'clock, it will begin at eight. American value promptness and may become angry if a person is more than 15 minutes late 25 a good reason. If you know you are going to be late, call 26 advance and let someone know. 27 you arrive late, you should apologized and explain why. Americans arrive 28 time for doctors" appointments. The doctor may keep you 29 , but if you keep the doctor waiting, you may get a bill 30 the doctor's time! 21into 22of 23for 24at 25without 26for 27If 28on 29waiting 30for 第五部分:英译汉(共3小题;每题5分,满分15分) I'm very much eager to improve my oral English. 我非常渴望提高我的英语口语 He has sympathy for all the poor people. 他同情所有的穷人 He offered to help us with our work. 他主动帮助我们的工作 第六部分:写作(满分15分) 请根据下面所给的题目用英语写出一篇不少于80词的短文。 How to keep Healthy

大学英语4第二次作业

作业二 一、单选题 1、- Would you please show me your bankbook - _________ A:Sorry, I have no idea. B:Here you are. C:Come with me. D:Yes, I'd like to. 2、-- Did you win the 100 metre race -- Yes, I did. -- Really -- _________. A:Congratulations B:Best wishes C:Good luck D:Right-I'm sorry. Bob is not in his office. -_________ A:Can you take a message for me B:Are you sure for that C:Would you like to leave a message D:Can you phone me-I haven't seen Belly for 10 years. 3、 4、- I'm sorry. I lost the key. - ________

A:Well, it's OK. B:No, it's all right. C:You are welcome. D:You are wrong. 5、- Wow! This is a marvelous room! I've never known you're so artistic. - ______ A:Great, I am very art-conscious. B:Don't mention it. C:Thanks for your compliments. D:It's fine. 6、______is the temperature today A:What B:How C:How many D:How much 7、I ______ my home work this time yesterday evening. A:were doing B:was to do C:am doing D:was doing 8、Had you come five minutes earlier, you ______ the train to Birmingham. But now you missed it. A:would catch B:would have caught C:could catch

相关文档
相关文档 最新文档