大学体验英语综合教程3课后习题答案(已整理排版)
Unit 1
Lead-in
1 human beings
2 powered
3 greenhouse
4 far away
5 make a differ ence
6 breathe in
7 decreasing performance
8 four inches high 9 campaign 10 encourage
Ex 3
1 B
2 B
3 C
4 A
5 D
Ex 4
issues, pollution, deforestation, related, consumption,
resources, threat, responsibility
Ex 5
1 addicted—smoking
2 environment—concern
3 expert—wisdom
4 possession—greed
5 resources—inexhaustible
Ex.6
1 strategies
2 specific
3 consumers
4 released
5 trapped
6 c onsequence
7 was isolated
8 priority 9 convenience 10 elements
Ex7
1 transform
2 all the way
3 sit back
4 resulting from
5 share…with
Ex.8
1 How did the war, which brought terrible disasters to
mankind, impact on such a poet?
2 Mothers are sometimes blind to the faults of their
beloved children, which will cause the children to make the
same mistake again.
3 As a new immigrant in this completely strange country,
she always felt isolated.
4 Acting before thinking often results in failure, so we
should think before we leap.
5 The time for talking is past; we must take positive
action to protect our environment.
Ex.9
1 Take two pills each time and three times a day and you will be well in a few days.
2 He is not impatient; he is just too tired.
3 Once water shortage reaches the point of no return, there will be n othing left to be done but abandon the city.
4 We’d like to share our experience in city planning with every repr esentative here and show them what is special of our innovations.
5 We can’t just sit back and do nothing about increasingly serious t raffic problems.
Ex 12
1 D
2 A
3 C
4 A
5 B
Ex. 13
1 subtle
2 were overtaken
3 species
4 decades
5 boundaries
6 audio
7 directly
8 focus 9 tone 10 cupped
Ex. 14
1 at that rate
2 For the sake of
3 come to
4 by hand
5 vic
e versa
Ex. 15
1 Young people sometimes complain of not being able to communicate with their parents.
2 Mary has been longing to take up residence in a Chinese village in Yunnan for a few years. Now her dream has
come true.
3 Domestic animals are used to depending on humans, so it is difficul t for them to survive in the wild.
4 He was suddenly overtaken by a fear that he would be
laid off the company because of depression.
5 I figure he’ll be back soon since he promised to have dinner with me.
Ex 16
1 go from bad to worse
2 loss of hope
3 fuels like petroleum and coal
4 very dry
5 a mass movement away from a place
Ex 17
1 我们大多数人只是袖手旁观，还会说：“让专家去处理吧。
2 就人类而言，母亲生病，孩子就会受苦；既然我们造成了地球上的生态失衡，而我们又是受害者。
3 机器的发明使世界进入了一个新纪元——工业时代，金钱主宰一切。
4 每个人的生活都有甜有苦。
5 麦肯立博士竭尽全力唤起公众对严峻的环保问题的关注。
6 那条消息让我惊出了毛骨悚然。
7 她在演讲中用了许多术语，使听众听得莫名其妙。
8 这些问题盘根错节，三言两语说不清楚。
Unit 2 Lead-in
1 invitations
2 around the world
3 reach
4 institution
5 specially appointed experts
6 vote
7 diploma
8 medal
9 is followed by 10 including
Ex3
1 C
2 D
3 A
4 C
5 B
Ex4.
compass, inspiration, curious, persistent, stimulated, inspired, geni us, complex
Ex5
1 condense—condensed
2 curious—curiosity
3 devise—device
4 persistent—persistence
5 convinced—convincing
Ex6
1 fundamental,
2 ultimate,
3 sparked,
4 apparently,
5 patience,
6 curiosity,
7 convince,
8 detail,
9 responses, 10 (has) stirred
Ex7
1 fooled...into,
2 came upon,
3 join in,
4 come up
with, 5 up to
Ex8
1. Reporters pressed the spokesman for an explanation of the military attack.
2. His election campaign failed to convince the voters that he was th
e right person for the Senator.
3. While I admit that there are problems, I don’t agree
that they cannot be solved.
4. His first speech on TV made a deep impression on his
audience.
5. All things are interrelated and interact with each other.
Ex9
1.She might have thought that history was just boring names and dates , but Professor Yi’s lectures completely changed her view.
2.After the plane crash, all the survivors could do was wait for resc ue on this desert island.
3.The little boy happened to read some stories about Bermuda Triangle that did stir his curiosity in the mysteries of nature.
4.The DNA test result was evidence to the police that the murderer wa s someone else.
5.Darwin was convinced that the theory of evolution is based on natur al selection.
Ex12
1 A
2 D
3 B
4 B
5 C
Ex13
1 classical,
2 breakthrough,
3 elegance,
4 faculty,
5 handful,
6 probe,
7 swift,
8 transition,
9 reactions, 10 retirement
E14
1 has brought in,
2 under his belt,
3 specializes in,
4 a wealth of ,
5 be applied to
Ex15
The lecturer at the conference turned out to be the
daughter of an old friend of mine.
2.It has been 5 years since his retirement, but he has
remained active in the academic circles.
3.If you do have financial difficulties, you can apply for a student loan.
4.This scientist had worked hard at this new material for
as long as ten years before he made his own way in the
end.
5.The chief airplane manufacturers in the world are pushing the envel ope to make faster and longer range airplanes to
compete for bigger share of the market.
Ex17
1 他有耐心和毅力，使他做事时坚持的时间比其他大多数孩童都长。（根据上下文，增加原文中省略的词语）
2 就其基本内容而言，这一学说提出的论点包括：光速是宇宙中最快的速度；…（增加修饰语，以示强调）
3扎威尔将收到世界各地的来信。短短几天时间里2000封电子邮件接踵而至。（增加量词以及原文上下文中所省略的部分）
4 但是，这位53岁的科学家将首先与家人共享这条喜讯。（增加原文上下文中所省略的部分）
Unit3
Lead-in
4 3 6 2 1 5
Ex3
1 A
2 B
3 C
4 A
5 B
Ex4
advertising, brand, promoted, proved, popular, expression, global,
immigrants
Ex5
1法国已经保证明年提供数十亿美元的援助。
2 你不应对不可能做到的事做出保证。
3 老板向他保证并没有解雇他的打算。
4 检查一下他的眼睛，以保证没有问题，是明智之举。
5 已经采取了措施来保证学生不会因经济原因而辍学。
6 生产商必须按规定保证其产品质量。
Ex6
1 attained
2 modest 3. attractive 4 precise 5 campaign
6 market
7 manufactures
8 sponsor
9 imported 10 brands
Ex7
1 frown (very much) on
2 for instance
3 as a result
4 when it comes to
5 under … umbrella
Ex8
1 Thoughts are expressed by means of language.
2 I have bought so many new books this year that it’s really
difficult for me to keep count of them.
3 The old lady feels assured that her son will come back home
today to celebrate her birthday.
4 His mother insisted that his pocket money should not exceed 100
yuan per month. 5 We bought a car last month, which was
registered under my name.
Ex9
1 For most American teenagers, when it comes to comfortable and
fashionable clothing, nothing beats T-shirts and jeans.
2 Starting in 2004, Adidas widely promoted that “impossible is
noth ing,” and the notion took hold.
3 When the news was first released online, the number of its
viewers beat the imagination.
4 The girl’s big break came with her outstanding performance at the singing co
ntest. 5 In many European countries people tend to
frown on in public places.
Ex12
1 C
2 D
3 C
4 A
5 B
Ex13
1 revenues
2 targeting
3 appliances
4 via
5 smashing
6 loyal
7 comparable
8 alongside
9 claiming 10 filmed
Ex14
1 beat…ex pectation
2 so far
3 built up
4 at home
5 on…basis
Ex15
1 A great man can dominate a difficult situation by force of
character.
2 According to the latest report, tourists do not have to apply for an entry vi sa to some Southeast Asian countries.
3 The color of the envelope suggests that the letter might be
from a woman.
4 Trains can’t rival planes for speed, but many people prefer
to travel by train.
5 People are much more likely to accept this mode of administration once they s ee that it really
works.
Ex16
1 The prime minister of Japan
2 Aides
3 The press
Ex17
1 天未下雪，但叶落草枯。
2 那时打我并且使我挨饿的不只是一个老太婆，而是老老少少各式各样的人。
3 我们能测量罐内的水量，但不能测量水的热度，我们还没有这种仪器。
4 温度增高，水的体积就增大。
5他的望远镜和实验总是给他带来惊奇的新发现，他每天都把工作情况记录下来。
Unit 4 Lead-in
1 got me wondering
2 it hit me
3 original me
4 bank statement
5 overdue books
6 unexplained charges
Ex3
1 C
2 B
3 C
4 D
Ex4
famous, promoting, religious, desperate, shortage, inevitable, failure
Ex5
1 1)
2 2)
3 3)1 2 1) 3 2) 2 3)2 3 1) 2 2) 3 3)2
Ex6
1 string
2 stir
3 controversy
4 combat
5 excessive
6 regulations
7 instincts
8 reckless
9 prohibition
10 irrational
Ex7
1 to his name
2 keep at bay
3 under the sun
4 jumped the gun
5 lined up
Ex8
1 The band shot to fame in the 1980s with that single album.
2 Take a risk, and you may lose again, but you would have improved your chances to win.
3 Scientists are pushing themselves to the limits in their research for finding
a cure for AIDS.
4 Now we see the point of the Internet: we can get information from all over th
e world just by clicking the mouse.
5 Some people believe the government will regulate the research of human clonin
g sooner or later.
Ex9
1 He is a legend with the biggest gate website in China to his name.
2 At the beginning of the twentieth century, Einstein shot to fame after he pub lished a series of articles on the Theory of Relativity.
3 The WTO is urging its member countries to adopt effective measures to keep bi rd flu at bay.
4 Like it or not, the traditional Chinese culture is invaded by foreign culture s.
5 You should not jump the gun in drawing the conclusion before your experiment is finished.
Ex12
1 composer
2 beginning
3 secret
4 clone
5 adopted
6 music
7 ordinary
8 prove
9 joke 10 genius
Ex13
1 ban
2 practically
3 survive
4 adopt
5 decent
6 genius
7 gene
8 anonymously
9 resemblance 10 immerse
Ex14
1 in the flesh
2 bring…to term
3 the roof fell in
4 put up for
5 have dug up
Ex15
1 George is nuts about Chinese culture and has decided
to learn Chinese in an evening school.
2 The reporters got wind of Di ana’s visit to the city and
rushed to the airport for the news.
3 After two months of restless effort, the police finally
tracked the criminal down in a southern city.
4 The two companies have already agreed in principle
to go ahead with the project.
5 If the quality of your products isn’t improving for real,
I don’t think they will be competitive in the market.
Ex16
1 It is obvious that he is a public-attention-getting man, not
an ordinary scientist;
controversy and pushing reproductive biology to its high-point make
him popular and successful.
2 The belief of the Raelians, a religious group, is that cloning is a most impo rtant way to achieve immortality and it claims that it has the necessary egg do nors and volunteers who are willing to be implanted with cloned embryos.
Ex17
1 我们高度地珍视同发展中国家的友好关系。
2 他不仅要负责产品的销售，还要负责广告宣传。
3 我去看他，可他已经出去了。
4 他倒是不抽烟，但他爸爸却一支又一支不停地抽。
5 我们讨论了很久才达成协议。
Unit 5
Lead-in
1 employment
2 handle the changes
3 concluded
4 very nature
5 builds on
6 involved in
7 at various stages
Ex3
1 B
2 D
3 B
4 A
5 C
Ex4
Passenger, eager, explain, vocabulary, ignorant, dictionary, explanations
Ex5
1 B
2 B
3 D
4 B
5 C
Ex6
1 quality
2 (had) committed
3 hint
4 assume
5 vague
6 peculiar
7 retreat
8 puzzled
9 misleading 10 confused
Ex7
1 resorted to
2 racking your/one’s brains
3 hangs on
4 jotted down
5 at a loss
Ex8
1 It’s one thing to understand the principle, it’s another thing
to put it into practice.
2 It is reported that jogging makes you three times less likely to suffer from
a heart attack.
3 Almost half of the British people have no idea what the euro is worth in rela tion to the pound, according to the latest survey.
4 The area should have been made into a park for everyone to enjoy but now some apartment buildings stand there.
5 I’m wondering whether all the related information could add up to a clear pi cture of him.
Ex9
1 It’s one thing to recognize the importance of saving energy, it’s another t o put it into practice in every aspect of life.
2 The sales manager believes that clever is not clever if the new product doesn
’t sell well.
3 He kept on making up excuses for his failure to finish the task as if a thous and lies would add up to the truth.
4 It is found from the investigation that the longer people stay in s store, th
e less likely they are to control their desire for purchases.
5 I believe that someone as diligent as she is will soon overcome difficulties in the study of English.
Ex12
1 D
2 C
3 C
4 D
5 B
Ex13
1 features
2 denied
3 appeal
4 usage
5 bet
6 independent
7 associate
8 w as stumped
Ex14
1 for the sake of
2 pick up
3 break your back
4 get at
Ex15
1 He drinks more wine than is good for health.
2 He knew that at this moment his parents were eagerly waiting for him to retur n home for the New Year.
3 What appeals to us is not only his intelligence but also his sense of humor.
4 The latest movie made by that internationally famous director turned out to b
e a total failure.
5 It seems that some youngsters don’t have patience with anything.
Ex16
1 A assumption. It serves as an assumptive condition on which the
writer would go back to college next fall.
2 B Reasoning. It gives the reason why the writer is read to
spend some time learning.
3 D Justification. It justifies the writer’s claim that education is not only
reason that he would go back to college.
4 C Explanation. It offers an explanation with examples, showing that college l ife is one of the best parts of one’s life.
Ex17
1 走出机场大楼我就看到外面好多出租汽车司机在穿梭走动，这（一现象）在世界各地的机场都是一样的。
2 迈尔斯先生仍然面带微笑，可是他的口气却有点不耐烦了。罗布很少见到这种情况。
3 难怪，一看见沿河而立的精美建筑时，我就想起了巴黎、阿姆斯特丹和威尼斯。
4 现在我意识到知识给人的巨大乐趣，这与如何使用知识无关。
5 她本想告诉约翰，没有料到他的知识竟有如此渊博，但又觉得有些不好不好意思，没有说出口。
Unit 6
Lead-in
1 holds for
2 uncomfortable
3 observation of life
4 on the road ahead
5 more rewarding
6 an additional fascination
7 their full attention
8 moving about
Ex3
1 C
2 D
3 B
4 A
5 C
Ex4
experience, culture, women, stay, impressive, pyramids, impressed, independence
Ex5
1 underdeveloped,
2 overpopulated,
3 outgrow,
4 interrelated,
5 counterpart
Ex6
1 counterpart,
2 efficient,
3 relief,
4 vague,
5 core,
6 punctually,
7 approach,
8 economy,
9 exception, 10 invite,
Ex7
1 pull…through,
2 belongs to,
3 ever since,
4 in turn,
5 milled about
Ex8
1 He breathed/heaved a sigh of sorrow and told us that he had seen a better day when he was young.
2 He has a strong sense of responsibility, and that’s why he is chosen to take control of the project.
3 Wherever you go, be it for business or pleasure, it is always a good idea to find out as much as you can about the place.
4 Let’s be careful. The situation may be about to repeat itself.
5 In, fact, the air quality of a house has a great deal to do with children’s health, and adults’ health for that matter.
Ex9
1 Do you know what it is like to stand on a stage with all eyes on you?
2 We all breathed a sigh of relief when news came that the hostage was rescued unharmed.
3 With his professional knowledge in finance and skills in management, he quick ly took control of the situation.
4 What became clear to me finally was this: they were not actually interested i n the solution of the problem.
5 Wherever he travels, be it a business trip or a sightseeing tour, he would al ways take a laptop with him.
Ex12
1 B
2 B
3 A
4 D
5 C
Ex13
1 stretches
2 intense
3 beloved
4 ability
5 positive
6 converting
7 manner
8 toast
9 absorbed 10 be sheltered
Ex14
1 in fine form
2 thanks to
3 give way to
4 is made up of
5 what makes…ticks
Ex15
1 Why is it that people spend so much time and money on traveling?
2 Traveling by air is quick and safe. No wonder it is a popular choice for trav elers.
3 Most of the students in my college have enrolled in the course of web page de sign and the computer center is always filled with people day and night.
4 It has always been my dream to have friends all over the world. Thanks to the Internet, my dream has come true.
5 Free information on-line, convenient communication with friends, attractive g ames, to him this is what Internet is all about.
Ex16
1 The car is very shabby now.
2 It’s our responsibility to protect the environment, but many of
us refuse to shoulder it.
3 A large number of religious leaders bombard his cloning plan as
an insult to human dignity.
4 I’m going to remain a scientist and work as usual. I will not go into the li melight.
Ex17
1 时近午夜，大街仍沐浴在闪烁柔和的光线中。
2 她在家里既忙着带孩子，又要下厨房。
3 总有人在关心你的进步。
4 我们要干就要干好。
5 这里有从全国各地来的人，其中有许多是南方人。
Ex18
1 For one thing
2 For another
3 In fact
4 Nevertheless
5 whereas
6 In contrast
7 Different from
8 In spite of
Unit 7 Lead-in
1 Depending on
2 it’s not real
3 unfortunately
4 interfere with
5 on the spot
6 brain damage
7 In addition to 8 violent with people
Ex3
1 D
2 D
3 B
4 C
5 A
Ex4
attend, contact, fit, typical, breakdown, shocked, permanent
Ex5
1 rural—urban 3 discloses—exposes 3 involving—involved
4 illustration—illusion
5 motivate—motivation
Ex6
1 deepened
2 were exposed
3 curled
4 throb
5 nightmare
6 utter
7 confusion
8 pulse
9 somewhat 10 creep
Ex7
1 on top of
2 as if
3 in a state of
4 ahead of
5 if only
Ex8
1 A lot of people believe that these hills help them sleep. All I can think is,“if they only knew.”
2 He kept chipping away at the problem until he had completely
solved it.
3 The country boy was exposed to many strange things in the city. He felt great ly shocked as if he had entered a future world.
4 Within only one year of graduating from college, he went from
a student who pursued his dream to a person who didn’t care
about a thing.
5 I have been given permission to do the interview in that area,
and that’ not something that everyone gets.
Ex9
1 If that college student only knew how hard his parents have
worked to support his education.
2 Jack’s dream came true when he signed the contract with an
NBA team.
3 We had an enjoyable conversation that day, and I felt as if we were old frien ds rather than two people who had just met.
4 I couldn’t believe my eyes when I saw my car in front of the restaurant, whi ch had been stolen two days before.
5 When her father lost his job a few years ago, life was an
uphill crawl for the whole family.
Ex12
1 a police detective
2 drug bust
3 a major operation/a big day
4 had failed to do a good job
5 arrest packets
6 violent crimes
7 smoothly/successfully 8 excited 9 a complete victory
10 they will eventually win
Ex13
1 coordinated
2 suspects
3 raids
4 venture
5 innocent
6 execute
7 afterwards
8 gang
9 issue 10 intelligence
Ex14
1 in charge of
2 carry out
3 on the edge of
4 laid out
5 gave…up
Ex15
1 With the begging of the war came ten years of killing and
destruction.
2 We shall continue to do what we have always been doing.
3 Most of them had been up since the morning before yesterday.
But none of them will sleep tonight either.
4 Born and raised in Chengdu, Li Ming still remembers the time
when he lived in a/the quadrangle.
5 He treated a young child in a cruel manner in broad daylight
and was taken to the police by the neighbors.
Ex17
1他解释了好一阵子，我也没有完全懂。
2 那种感觉就好像我打开了一个秘密天地，到了天堂一般。
3 这就是摇头丸带给我的后果—但事情还不止于此。
4 已经凌晨三点，大多数人从头天早晨起就没合过眼。
5 他费了不少劲才找到回家的路。
6 他从不休息，总是拼命地干。
Unit 8
Lead-in
1 shadow of fear
2 at every stage
3 nuclear weapons
4 peace operations
5 en gaged in conflict
6 religious groups
7 economic development
8 find better wa ys
Ex3
1 D
2 C
3 A
4 B
5 B
Ex4
refugee, adjust, contact, movement, nervous, military, care, indifference
Ex5
1 B
2 D
3 A
4 C
5 A
Ex6
1 venture
2 comfortable
3 confine
4 dazed
5 drifted
6 lingered
7 bewildered
8 overwhelmed
9 innocent 10 terrified
Ex7
1 sticks out
2 come by
3 under way
4 in search of
5 adjust to
Ex8
1 The theft in recent months paled in comparison with this case.
2 Several years have passed since the traffic accident, and he
stills can’t shake away the guilty feeling.
3 Though we had put forward a proposal to reduce cost,
the board members didn’t appear to take it seriously.
4 The bare hills around haven’t reminded the villagers of the
importance of protecting the environment.
5 It is unlikely for his hearty laughter to ring in our office
again.
Ex9
1 Mandela had just returned to his homeland, after an absence of 18 years he sp ent in prison.
2 No visitor can venture into the isolation ward without proper
protection. 3 No late comer will be admitted once the concert is
under way.
4 I thought I was unlucky but my experience pales in comparison
to yours.
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13,。有助于提高肌肉力量的训练方法有哪些？ 卧推 14．下列不易于发展柔韧素质的练习时段或状态有哪些？（这个也不清楚，是看它字体颜色不一样）身体极其疲惫 15．20世纪50年代末期，巴西人创造了哪种阵型被誉为足球史上的第二次变革。 “四二四”阵形 16.曾经在NBA总决赛中受伤，坚持参加比赛最后获得冠军并取得最有价值称号的凯尔特人球星是（）？ 保罗皮尔斯 17.体育锻炼与传统心理治疗手段同样具有抗抑郁效能，是治疗抑郁症的（）手段；体育锻炼治疗抗抑郁症的效果与药物相比比较（）。 辅助；持久 18.在运动中不慎扭伤，下列做法不正确的是（） 马上揉搓患处 19.20XX年伦敦奥运会羽毛球囊括多少枚金牌？ 5 20.“让参与者成为享受运动，实现人生潜能的一代”是哪一个健康促进的愿景？ 为动而生 21.减小肚皮应采用哪一类运动？ 长时间低强度 22.棍多以抡、劈、扫、云等法为主，大多是横方向用力，动作幅度较大，其特点：一招一式虎虎生威，动如疾风骤雨，产生"棍打一大片"的效果。棍被称为（） 百兵之首 23.作为当下盛行的舞蹈元素，以人体中段（腰、腹、臀部）的各种动作为主，具有阿拉伯风情的舞蹈形式是（）。肚皮舞
新标准大学英语综合教程3课后习题答案
Unit1 Active reading(1) 4. b c c d c a 5.productive attendance resistance ambitious acceptance script impressive 6.attendance ambitious productive impressive resistance script acceptance 7.mortgage deck surf coastal;defy lengthy 8.b a b b b a b b Active reading(2) 4.triple cemetery rear biography cram budding finite elapse 5.elapsed;cemetery rear;crammed triple budding;biography finite 6.a b a a b b a a 7.a b b a a b b b a Language in use 6.(1)我们都觉得在校时间不多了，以后再也不会有这样的学习机会了，所以都下定决心不再虚度光阴。当然，下一年四五月份的期末考试最为重要。我们谁都不想考全班倒数第一，那也太丢人了，因此同学们之间的竞争压力特别大。以前每天下午5点以后，图书馆就空无一人了，现在却要等到天快亮时才会有空座，小伙子们熬夜熬出了眼
袋，他们脸色苍白，睡眼惺忪，却很自豪，好像这些都是表彰他们勤奋好学的奖章。 （2）明天行吗？明天只是个谎言；根本就没有什么明天，只有一张我们常常无法兑现的期票。明天甚至压根儿就不存在。你早上醒来时又是另一个今天了，同样的规则又可以全部套用。明天只是现在的另一种说法，是一块空地，除非我们开始在那里播种，否则它永远都是空地。你的时间会流逝（时间就在我们说话的当下滴答滴答地走着，每分钟顺时针走60秒，如果你不能很好地利用它，它就会走得更快些），而你没有取得任何成就来证明它的存在，唯独留下遗憾，留下一面后视镜，上面写满了“本可以做”“本应该做”“本来会做”的事情。 7.(1)Students differ about whether they should have their future mapped out when they are still at university .Some think they should have a definite goal and detailed plan, so as to brace themselves for any challenges, whereas some others think they don’t have to think much about the future , because future is full of uncertainties. （2）After a very careful check-up ,the scientist was told he had got a fatal disease .Although he knew that his life was ticking away ,instead of complaining about the fate ,the scientist decided to make the best of the remaining days ,and speed up the research project he and his colleagues initiated ,and have a shot at completing it ahead of schedule.
大学物理学(第三版)课后习题参考答案
习题1 1.1选择题 (1) 一运动质点在某瞬时位于矢径),(y x r 的端点处，其速度大小为 (A)dt dr (B)dt r d (C)dt r d | | (D) 22)()(dt dy dt dx [答案：D] (2) 一质点作直线运动，某时刻的瞬时速度s m v /2 ，瞬时加速度2 /2s m a ，则一秒钟后质点的速度 (A)等于零 (B)等于-2m/s (C)等于2m/s (D)不能确定。 [答案：D] (3) 一质点沿半径为R 的圆周作匀速率运动，每t 秒转一圈，在2t 时间间隔中，其平均速度大小和平均速率大小分别为 (A) t R t R 2, 2 (B) t R 2,0 (C) 0,0 (D) 0,2t R [答案：B] 1.2填空题 (1) 一质点，以1 s m 的匀速率作半径为5m 的圆周运动，则该质点在5s 内，位移的大小 是 ；经过的路程是 。 [答案： 10m ； 5πm] (2) 一质点沿x 方向运动，其加速度随时间的变化关系为a=3+2t (SI)，如果初始时刻质点的速度v 0为5m·s -1，则当t 为3s 时，质点的速度v= 。 [答案： 23m·s -1 ] (3) 轮船在水上以相对于水的速度1V 航行，水流速度为2V ，一人相对于甲板以速度3V 行走。如人相对于岸静止，则1V 、2V 和3V 的关系是 。 [答案： 0321 V V V ]
1.3 一个物体能否被看作质点，你认为主要由以下三个因素中哪个因素决定： (1) 物体的大小和形状； (2) 物体的内部结构； (3) 所研究问题的性质。 解：只有当物体的尺寸远小于其运动范围时才可忽略其大小的影响，因此主要由所研究问题的性质决定。 1.4 下面几个质点运动学方程，哪个是匀变速直线运动？ （1）x=4t-3；（2）x=-4t 3+3t 2+6；（3）x=-2t 2+8t+4；（4）x=2/t 2-4/t 。 给出这个匀变速直线运动在t=3s 时的速度和加速度，并说明该时刻运动是加速的还是减速的。（x 单位为m ，t 单位为s ） 解：匀变速直线运动即加速度为不等于零的常数时的运动。加速度又是位移对时间的两阶导数。于是可得（3）为匀变速直线运动。 其速度和加速度表达式分别为 2 2484 dx v t dt d x a dt t=3s 时的速度和加速度分别为v =20m/s ，a =4m/s 2。因加速度为正所以是加速的。 1.5 在以下几种运动中，质点的切向加速度、法向加速度以及加速度哪些为零哪些不为零？ (1) 匀速直线运动；(2) 匀速曲线运动；(3) 变速直线运动；(4) 变速曲线运动。 解：(1) 质点作匀速直线运动时，其切向加速度、法向加速度及加速度均为零； (2) 质点作匀速曲线运动时，其切向加速度为零，法向加速度和加速度均不为零； (3) 质点作变速直线运动时，其法向加速度为零，切向加速度和加速度均不为零； (4) 质点作变速曲线运动时，其切向加速度、法向加速度及加速度均不为零。 1.6 ｜r ｜与r 有无不同?t d d r 和d d r t 有无不同? t d d v 和t d d v 有无不同?其不同在哪里?试举例说明． 解：（1）r 是位移的模， r 是位矢的模的增量，即r 12r r ，12r r r ； （2） t d d r 是速度的模，即t d d r v t s d d . t r d d 只是速度在径向上的分量. ∵有r r ?r （式中r ?叫做单位矢），则 t ?r ?t r t d d d d d d r r r 式中 t r d d 就是速度在径向上的分量，
研究生英语教材课后习题解答上册
Unit 1 Text A Exercises 1. Reading comprehension A. Read the text and answer the following questions. 1. What, according to the author, do Americans love? Cite examples to illustrate your point. Americans love new frontiers. For example, they hanker after wide-open spaces; they like to explore; they like to make rules but refuse to follow them. 2. Is there a place on earth where you can go and be yourself? What is the place according to the author? According to the author, there is a place—cyberspace, where you can go and be yourself. 3. What metaphor does the author use to describe cyberspace? Why does she use such a metaphor? Real estate, because both real estate and cyberspace consist of different parts and each part is suitable for a particular group of people. 4. Does the author approve of regulating cyberspace? Why or why not? Yes, but first, it is fundamental to understand the nature of cyberspace. 5. What does the author think is needed in cyberspace besides government
综合教程3课后翻译答案12345911
Unit 1 1.听到她屡遭失败的消息，我感到很难过 (distress ) It distressed me a great deal to hear the news that he had suffered repeated failure. 2.他虽然失去了老板的欢心，但仍然装出一副高兴的样子(assume) He assured an air for cheerfulness, even though he lost favor with his boss. 3.格列佛( Gulliver )经历了冒险奇遇，见到了各色奇异的人物 assortment ) Gulliver met with extraordinary adventures and saw a strange assortment of people. 4.如果你再犯同样的错误，他会很生你气的 ( furious ) He will be furious with you if you repeat the same mistake. 5.我们都被他坦率的观点、幽默的语言和亲切的态度所深深吸引 draw) We were all greatly drawn by his frank views, humorous words and genial manner. 6.等到欢呼的掌声平息下来，那位诺贝尔奖获得者开始演讲down) After cheers and applause died down, the Nobel Prize Winner began his speech. 7.他天生有一种特别的洞察力和预见力，因此，他很少随大流die run
2014版大学物理教材课后习题答案
P31 第一章 习题答案 3. 一质点沿x 轴运动，其加速度a 与位置坐标x 的关系为 a ＝2＋6 x 2 (SI) 如果质点在原点处的速度为零，试求其在任意位置处的速度． 解：设质点在x 处的速度为v ， 62d d d d d d 2x t x x t a +=?== v v ()x x x d 62d 0 2 ?? += v v v () 2 2 1 3 x x +=v 4.有一质点沿x 轴作直线运动，t 时刻的坐标为x = 4.5 t 2 – 2 t 3 (SI) ．试求： (1) 第2秒内的平均速度； (2) 第2秒末的瞬时速度； (3) 第2秒内的路程． 解：(1) 5.0/-==??t x v m/s (2) v = d x /d t = 9t - 6t 2 v (2) =-6 m/s (3) S = |x (1.5)-x (1)| + |x (2)-x (1.5)| = 2.25 m 5. 一质点沿半径为R 的圆周运动．质点所经过的弧长与时间的关系为2 2 1ct bt S + = 其中b 、c 是大于零的常量，求从0=t 开始到切向加速度与法向加速度大小相等时所经历的时间． 解： ct b t S +==d /d v c t a t ==d /d v ()R ct b a n /2 += 根据题意： a t = a n 即 ()R ct b c /2 += 解得 c b c R t -= 6.由楼窗口以水平初速度0v 射出一发子弹，取枪口为原点，沿0v 方向为x 轴，竖直向下为y 轴，并取发射时刻t 为0，试求： (1) 子弹在任一时刻t 的位置坐标及轨迹方程； (2) 子弹在t 时刻的速度，切向加速度和法向加速度． 解：(1) 2 02 1gt y t x = = , v 202/2 1v g x y = (2) v x = v 0，v y = g t ，速度大小为： 2 22 02 2 t g y x +=+=v v v v 方向为：与x 轴夹角 θ = tg -1( gt /v 0) 222 02//d d t g t g t a t +==v v 与v 同向．
慕课测试题答案
1计算之树中，通用计算环境的演化思维是怎样概括的？________。 A.程序执行环境—由CPU-内存环境，到CPU-存储体系环境，到多CPU-多存储器环境，再到云计算虚拟计算环境 B.网络运行环境---由个人计算机、到局域网广域网、再到Internet C.元器件---由电子管、晶体管、到集成电路、大规模集成电路和超大规模集成电路 D.上述全不对 正确答案：A
2计算之树中，网络化思维是怎样概括的________。 A.局域网、广域网和互联网 B.机器网络、信息网络和人-机-物互联的网络化社会 C.机器网络、信息网络和物联网 D.局域网络、互联网络和数据网络 正确答案： B
3人类应具备的三大思维能力是指_____。 A.抽象思维、逻辑思维和形象思维 B.实验思维、理论思维和计算思维 C逆向思维、演绎思维和发散思维 D.计算思维、理论思维和辩证思维 正确答案：B
4如何学习计算思维？_____。 A.为思维而学习知识而不是为知识而学习知识 B.不断训练，只有这样才能将思维转换为能力 C.先从贯通知识的角度学习思维，再学习更为细节性的知识，即用思维引导知识的学习 D.以上所有 正确答案：D
5自动计算需要解决的基本问题是什么？_______。 A.数据的表示，数据和计算规则的表示 B.数据和计算规则的表示与自动存储 C数据和计算规则的表示、自动存储和计算规则的自动执行D.上述说法都不正确 正确答案：C
6计算机器的基本目标是什么？ _______。 A.能够辅助人进行计算，能够执行简单的四则运算规则 B.能够执行特定的计算规则，例如能够执行差分计算规则等 C.能够执行一般的任意复杂的计算规则 D.上述说法都不正确 正确答案：C
新世纪大学英语综合教程3课后答案Unit(1)
Unit Two Love Enhance Your Language Awareness Words in Action ▆ Working with Words and Expressions 1.In the box below are some of the words you have learned in this unit. Complete the following sentences with them. Change the form where necessary. ▆ Answers: 1)curled 2)minimum 3)clip 4)yielded 5)Given 6)preserve 7)fascinated 8)affection 9)interact 10)haste 11)grief 12)defies 13)presence 14)acquire 15)manipulate 16)restraints 2.In the box below are some of the expressions you have learned in this unit. Do you understand their meanings? Do you know how to use them in the proper context? Now check for yourself by doing the blank-filling exercise. Change the form where necessary. ▆ Answers: 1)let, loose on 2)fit into 3)hold on 4)state of affairs 5)in the course of 6)in vain 7)build, on 8)In short 9)reached for 10)g ive and take ▆Increasing Your Word Power 1.The prefix over-can be added to nouns, verbs, adjectives and adverbs, meaning “above”, “outside”,
教材课后习题参考答案新版_学生版(1-4)章_
《Visual Basic程序设计基础》教材 习题 第1章 Visual Basic 6.0程序设计概述 习题 一、判断题 参考答案： 1．√2．√3．√4．×5．√6．×7．√8．×9．√10．√11．×12．√13．×14．√15．√ 二、选择题 参考答案： 1. C 2. B 3．D 4．C 5．B 6．A 7．D 8．A 9．B 10．D 三、填空题 参考答案： 1．对象、事件2．属性、方法、事件3．控件、屏幕（Screen） 4．Left 5. Top 6．属性、<对象名>.<属性名>=<表达式> 7．网格8．F o rm1 9．Load或Initialize或Resize或Activate（自动执行的先后顺序也按此排列） 10．Activate、Deactivate 四、程序设计题 参考代码： 程序1．界面设计参看表1。 表1 各控件的主要属性设置
过程设计如下： Private Sub Command1_Click() Label2.Visible = False ‘使控件Label2看不见 Label1.Caption = Text1.Text + ": 欢迎使用" + Label1.Caption Text1.Visible = False ‘使控件Text1看不见Command1.Enabled = False ‘使控件Command1不能用Command2.Enabled = True ‘使控件Command2能用End Sub Private Sub Command2_Click() End ‘结束程序运行 End Sub 程序2．界面设计， 过程设计如下： Private Sub Command1_Click() '字体变大 Form1.FontSize = Form1.FontSize + 3 Form1.Cls: Print "欢迎使用VB" End Sub Private Sub Command2_Click() '字体变小 Form1.FontSize = Form1.FontSize - 3 Form1.Cls Print "欢迎使用VB" End Sub Private Sub Command3_Click() '字体加粗 Form1.FontBold = True
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