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南安侨光中学2014届高三年实验班第四次阶段考试

南安侨光中学2014届高三年实验班第四次阶段考试
南安侨光中学2014届高三年实验班第四次阶段考试

南安侨光中学2014届高三年实验班第四次阶段考试

英语试卷

命题:陈明正审核:杨春煌

第I卷(共三部分,115分)

第一部分:听力(共两节, 满分30分)

第一节: 听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

1. What is the woman’s opinion of traveling by air?

A. Too expensive.

B. Too comfortable.

C. Too quick.

2. When was the woman born?

A. In May.

B. In June.

C. In March.

3. Why hasn’t the woman ever thought of going by plane?

A. It’s too dangerous.

B. It’s hard to get plane tickets.

C. It’s too expensive.

4. Why did the man get a ticket?

A. He drove too slow.

B. He ran a red light.

C. He parked at the wrong place.

5. What do we learn from the conversation?

A. The man wants to go to Los Angeles

B. The man wants to go to San Francisco.

C. There are no flights to Los Angeles for the rest of the day.

第二节: 听下面5段对话或独白。每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听第6段材料,回答第6至7题。

6. Why does the woman want to buy a computer?

A. To help her with her lessons.

B. To help her to write a book.

C. To look up information from the Internet.

7. What is the man’s job?

A. A computer salesman.

B. A computer engineer.

C. A computer teacher.

8. Whose mother is ill?

A. Jeff’s.

B. Jack’s.

C. Richard’s.

9. With whom did the man go traveling?

A. Maria.

B. His dog.

C. Jeff and Richard.

10. What happened to Richard?

A. He started a new job.

B. He went traveling with Jeff.

C. He stayed at home during the man’s traveling..

听第8段材料,回答第11至13题。

11. What is not true about the man?

A. He can not breathe well after a walk

B. Water is running down his breast.

C. He hasn’t been sleeping well because of the pain in his breast.

12. What has caused the sleeplessness?

A. His pain in the breast.

B. He was burnt by boiling water.

C. He doesn’t know.

13. What’s the woman speaker’s name?

A. Doctor Cook.

B. Doctor Martin.

C. Not told(未知).

听第9段材料,回答第14至16题。

14. What’s the purpose of Diana’s new project?

A. To teach students some basic writing skills.

B. To write articles for the Campus Literature Review.

C. To help those who want to get their work published.

15. What is Diana’s suggestion to Tom?

A. Keep trying even if he is turned down.

B. Ask an experienced writer to be his consultant.

C. Try to polish(润色)his works in the creative writing class.

16. Why does Tom agree to join the group?

A. He can get his poems published.

B. He can contribute essays to the group.

C. He can get some advice from other members.

17. What special food did Mrs. Wilson cook that day?

A. Some beef.

B. Some meat.

C. Some fish.

18. How did Mrs. Wilson first feel that day?

A. Happy but lonely.

B. Tired and unhappy.

C. Tired but happy.

19. What was Mrs. Wilson worried about?

A. The food.

B. The visitors’ lives.

C. Her neighbor’s cat.

20. What did the neighbor’s call mean to Mrs. Wilson?

A. She didn’t need to worry about anything.

B. She would be sorry to hear this news.

C. She would be unhappy about the news.

第二部分:英语知识运用(共两节, 满分45分)

第一节:单项填空(共15小题,每小题1分,满分15分)

21. Since there is no such _____ thing as a free lunch in the world, ____ local people of that town

decided to build their home by themselves.

A. a; the

B. /; /

C. /; the

D. a; /

22. -Any information about your son?

-No,if only I ______ those tough words to him.

A. didn’t say

B. hadn’t said

C. shouldn’t have said

D. couldn’t hav e said

23. Last night Mr. Crook didn’t come back at the usu al time. ______,he met some friends and

stayed out until midnight.

A. Meanwhile

B. However

C. Instead

D. Thus

24. Of the two readable books, which do you think is ______ one for me to read?

A. a more suitable

B. more suitable

C. a suitable

D. the more suitable

25. Music should be taught routinely in schools because of the benefits _____ can have on the

development of the brains of young children.

A. which

B. that

C. one

D. it

26. ______ was most important to her, she told me, was her family.

A. This

B. What

C. As

D. It

27.Through years of hard work, Mrs. Smith, who ____ as a secretary for five years, is general

manager of the company now.

A. serves

B. served

C. has served

D. had served

28. Sam _____ some knowledge of the computer just by watching others working on it.

A. brought up

B. put up

C. set up

D. picked up

29. Generally speaking, ______according to the directions, the drug has no side effect.

A. when taking

B. when taken

C. when to take

D. when to be taken

30. It is the third time so far that such a festival ________in my hometown.

A.has held B.has been held C.will be held D. had been held

31. In our class there are 46 students, _____ half wearing glasses.

A. in whom

B. in them

C. of whom

D. of them

32. Judging from the present situation, there is no _____of peace between two neighboring country.

A. signal

B. mark

C. sign

D. symbol

33. The children in the rural village presented us ______ warm welcome, which moved us a lot.

A. with

B. to

C. on

D. of

34. The church, _______ the splendid sunset, took on a scene of holiness.

A. filled with

B. washed in

C. covered with

D. bathed in

35. He is a ______ customer of that coffee bar, which enables him to have affairs with girls.

A. typical

B. regular

C. ordinary

D. general

第二节完形填空(共20小题;每小题1.5分,满分30分)

In some cities, workaholism(废寝忘食工作)is so common that people don’t consider it unusual. They accept the lifestyle as 36 . Government workers in Washington, D. C., 37 , frequently work sixty to seventy hours a week. They don’t do this because they have to; they do it because they 38 to. Workaholism can be a 39 problem. Because true workaholics would rather work than do anything else, they 40 have no idea of how to relax; that is, they might not 41 movies, sports, or other types of entertainment. Most of all, they 42 to sit and do nothing. The lives of workaholics are usually stressful, and this tension and worry can cause 43 problems such as heart attacks and stomach diseases. 44 , typical workaholics don’t pay much attention to their families. Their marriages may end in 45 as they spend little time with their families.

Is workaholism 46 dangerous? Perhaps not. There are, certainly, people who work 47 __ under stress. Some studies show that many workaholics have great energy and interest in

work. They feel 48 is so pleasurable that they are actually very happy. For most workaholics, work and entertainment are the same thing. Their jobs 49 them with a challenge; this keeps them busy and creative.

50 do workaholics enjoy their jobs so much? There are several 51 to work. Of course, it provides people with paychecks, and this is important. But it offers 52 financial security. It provides people with self-confidence; they have a feeling of satisfaction 53 they have produced a challenging piece of work and are able to say “I 54 it”. Psychologists claim that their work gives people an identity. After they take part in work, they 55 a sense of self and individualism.

36. A. strange B. boring C. pleasant D. normal

37. A. for example B. on the other hand C. what’s more D. after all

38. A. agree B. promise C. dare D. want

39. A. slight B. serous C. obvious D. difficult

40. A. still B. probably C. certainly D. mostly

41. A. afford B. enjoy C. watch D. allow

42. A. dream B. decide C. intend D. hate

43. A. physical B. cultural C. social D. mental

44. A. Therefore B. However C. Anyway D. Besides

45. A. happiness B. silence C. failure D. loss

46. A. sometimes B. always C. seldom D. hardly

47. A. sadly B. differently C. efficiently D. slowly

48. A. study B. family C. life D. work

49. A. equip B. pack C. provide D. fill

50. A. When B. Why C. How D. Where

51. A. factors B. advantages C. steps D. ways

52. A. no more B. more or less C. no more than D. more than

53. A. when B. why C. how D. where

54. A. valued B. failed C. caught D. made

55. A. give B. lose C. get D. need

第三部分:阅读理解(共20小题,每题2分,满分40分)

A

The Queen’s English is now sounding less upper-class, a scientific study of the Queen’s Christmas broadcasts has found. Researchers have studied each of her messages to the Commonwealth countries since 1952 to find out the change in her pronunciation from the noble Upper Received to the Standard Received.

Jonathan Harrington, a professor at Germany’s University of Munich, wanted to discover whether accent changes recorded over the past half century would take place within one person. “As far as I know, there just is nobody else for whom there is this sort of broadcast records,” he said.

He said the noble way of pronouncing vowels(元音) had gradually lost ground as the noble upper-class accent over the past years. “Her accent sounds slightly less noble than it did 50 years ago. But these are very, very small and slow changes that we don’t notice from year to year.”

“We may be able to relate it to changes in the social classes,” he told The Daily Telegraph, a British newspaper. “In 1952 she would have been heard saying ‘thet men in the bleck het’. Now it would be ‘that man in the black hat’. Similarly, she would have spoken of ‘the citay’ and‘dutay’, rather than ‘citee’ and ‘dutee’, and ‘hame’ rather than ‘home’. In the 1950s she would have been ‘lorst’, but by the 1970s ‘lost’.”

The Queen’s broadcast is a personal message to the Commonwealth countries. Each Christmas, the 10-minute broadcast is put on TV at 3 pm in Britain as many families are recovering from their traditional turkey lunch.

The results were published in the Journal of Phonetics.

56. The Queen’s broadcasts were chosen for the study mainly because.

A. she has been Queen for many years.

B. she has a less upper-class accent now.

C. her speeches have been recorded for 50 years.

D. her speeches are familiar to many people.

57. Which of the following is an example of a less noble accent in English?

A. “Dutay”.

B. “Hame”.

C. “Citee”.

D. “Lorst”.

58. We may infer from the text that the Journal of Phonetics is a magazine on .

A. Christmas customs

B. speech sounds

https://www.wendangku.net/doc/6214613946.html, broadcasting

D. personal messages

59. What is the text mainly about?

A. The ch anges in a person’s accent.

B. The Queen’s Christmas speeches on TV.

C. The relationship between accents and social classes.

D. The recent development of the English language.

B

Built in 1794 for the 5th Duke of Bedford, this hotel in the heart of Bedford overlooks the River Ouse, which winds through the beautiful Bedfordshire countryside.

We offer a flexible approach to conferencing. With purpose-built meeting rooms offering a flexible and functional space, our hotel is designed for comfort and convenience. Day Delegate(代表/代表团), 24 Hour Delegate or room hire only can be arranged to meet your needs and we offer a range of food and drinks for all requirements.

The Bedford Swan Hotel provides an impressive range of conference, training and function rooms which are suitable for up to 250 delegates.

Our hotel is located 30 minutes drive from Luton Airport and a 20-minute walk from Bedford Train Station with regular trains to and from Central London.

What to expect:

? A professional service from the beginning

? Your own event consultant

? A great location with car parking

? Well equipped rooms perfect for your meeting or event

? Various Day Delegate packages

? Personalized dining and refreshment breaks

? Accurate billing

Discounted Day Delegate Rates from £35 per person:

* Hold your meeting before 30th November 2013 and benefit from our special day delegate rates * Day Delegate Rate from £35.00 per person

* Minimum numbers of 8 apply

Call us on 01234 346565 or e-mail us on info@https://www.wendangku.net/doc/6214613946.html,

60. Bedford Swan Hotel is more suitable for _______.

A. busy sightseers

B. conference travelers

C. fresh trainees

D. event consultants

61. Which of the following is true according to the text?

A. It takes you 20 minutes to walk here from Central London.

B. The Bedford Swan Hotel was built in the late 18th century.

C. The hotel is located sixty kilometres from Luton Airport.

D. Guests can get professional service by offering extra tips.

62. From the advertisement above we can learn that Bedford Swan Hotel _______.

A. can serve up to 250 delegates

B. winds through Bedfordshire

C. can provide personalized billing

D. offers no car parking service

63. The special discount will be given if _______.

A. a delegate of 8 apply for 24-hour-meeting rooms.

B. guests pay £35.00 per person for the rooms they live in.

C. you book a purpose-built meeting room on a special day.

D. 8 delegates hold a day meeting on November 2, 2013.

C

One Sunday, my fam ily had gathered at my parents’ house to feast upon Mom’s wonderful cooking. During the normal dinner chatter (闲聊), I noticed that my father was slurring (说话含混) his words. No one mentioned this during dinner, but I felt compelled to discuss it with my mother afterward.

We decided that there was something seriously wrong and that Dad needed to see the doctor. Mom phoned me two days later. “The doctor found a brain tumor (肿瘤). It’s too large at this point to operate. Maybe they can do something then, but the odds are long.”

Even with the treatment, my father’s condition worsened, and the doctor finally informed us that this condition was terminal (晚期的). During one of his stays in the hospital, we brought our baby daughter Chelsey with us when we visited him. By this time he had great difficulty speaking.

I finally figured out that he wanted Chelsey to sit on his stomach so he could make faces at her. Watching the two of them together, I realized I was living an experience that would stay with me forever. Though grateful for the times they could share, I couldn’t shake the feeling of a clock

On the visit to my parents’ home during what we all know was my father’s last days, my mother took Chelsey from my arms and announced, “Your fathe r would like to see you alone for a

minute.”

I entered the bedroom where my father lay on a rented hospital bed. He appeared even weaker than the day before.

“How are you feeling, Dad?” I asked. “Can I do anything for you?”

He tried to speak, but he couldn’t make out a word.

“I’m sorry, but I can’t understand you,” I said.

With great difficulty he said, “I love you.”

We don’t learn courage from heroes on the evening news. We learn true courage from watching ordinary people rise above hopeless situations. In many ways my father was a strict, uncommunicative man. He found it difficult to show emotion. The bravest thing I ever saw him do was overcome that barrier to open his heart to his son and family at the end of his life.

64. Which of the following statements is TRUE?

A. The writer accompanied his father to a medical examination.

B. The writer’s father got worse after the removal of the brain tumor.

C. The writer was quick to notice the strange condition of his father.

D. The writer’s father had known about his illness before the writer discovered it.

65. What does the underlined sentence “the odds are long” mean?

A. There’s little possibility for Father to recover.

B. It takes a long time for Father to recover.

C. Father needs love and care from his family.

D. They need a proper time to operate on Father.

66. The father had never said “I love you” to the writer before because ________.

A. he believed in strictness and punishment.

B. he was not so attached to the writer.

C. he thought there was no need to tell the writer.

D. he was not used to openly showing his emotions.

67. What does the writer attempt to tell us?

A. We don’t often value health until we lose it.

B. Don’t wait to see a doctor till it is too late.

C. Life is short, so live your life to the fullest.

D. Bravely express your love for your family.

D

Thirteen vehicles lined up last March to race across the Mojave Desert, seeking a million in prize money. To win, they had to finish the 142-mile race in less than 10 hours. Teams and watchers knew there might be no winner at all, because these vehicles were missing a key part—drivers.

DARPA, the Defense Advanced Research Projects Agency, organized the race as part of a push to develop robotic vehicles for future battlefields. But the Grand Challenge, as it was called, just proved how difficult it is to get a car to speed across an unfamiliar desert without human guidance. One had its brake lock up in the starting area. Another began by throwing itself onto a wall. Another got tied up by bushes near the road after 1.9 miles.

One turned upside down. One took off in entirely the wrong direction and had to be disabled by remote control. One went a little more than a mile and rushed into a fence; another managed to go for six miles but stuck on a roc k. The “winner,” if there was any, reached 7.8 miles before it ran into a long, narrow hole, and the front wheels caught on fire.

“You get a lot of respect for natural abilities of the living things,” says Reinhold Behringer, who helped design two of the ear-size vehicles for a company called Sci-Autonics, “Even ants can do all these tasks effortlessly. It’s very hard for us to put these abilities into our machines.”

The robotic vehicles, though with necessary modern equipment such as advanced computers and GPS guidance, had trouble figuring out fast enough the blocks ahead that a two-year-old human recognizes immediately. Sure, that very young child, who has just only learned to walk, may not think to wipe apple juice off her face, but she already knows tha t when there’s a cookie in the kitchen she has to climb up the table, and that when she gets to the cookie it will taste good. She is more advanced, even months old, than any machine humans have designed.

68. DARPA organized the race in order to ______.

A. raise money for producing more robotic vehicles.

B. push the development of vehicle industry.

C. train more people to drive in the desert.

D. improve the vehicles for future wars.

69. From the passage we know “robotic vehicles” are a kind of m achines that ______.

A. can do effortlessly whatever tasks living things can.

B. can take part in a race across 142 miles with a time limit.

C. can show off their ability to turn themselves upside down.

D. can move from place to p1ace without being driven by human beings.

70. In the race, the greatest distance one robotic vehicle covered was_____ .

A. about eight miles

B. six miles

C. almost two miles

D. about one mile

71. In the last paragraph, the writer implies that there is a long way to go____.

A. for a robotic vehicle to finish a 142-mile race without any difficulties.

B. for a little child who has just learned to walk to reach the cookie on the table.

C. for a robotic vehicle to deal with a simple problem that a little child can solve.

D. for a little child to understand the importance of wiping apple juice off its face.

E

With only a click of the mouse, rumors can be forwarded between microblogs very quickly. As an example, recently, perceptive netizens discovered that some photos displayed on microblogs describing Beijing’s June rainstorm had actually been fabricated.

https://www.wendangku.net/doc/6214613946.html, is one of the major internet portals(门户网站) in China with hundreds and thousands of users, and a majority of celebrities and renowned citizens have their microblog accounts on this portal. As recently as six months ago, the website decided to establish a specialized team to identify rumors and provide accurate information for its users. Tan Chao is in charge of the team.

“Before I took the job, I usually couldn’t identify what information was real and what was fake. But during the rumor verification process, we discovered that a lot of information was false, including fake photos, fake news stories and rumors that had been spread through microblog s.”

It‘s not just website portals which are taking on fact-checking responsibilities, but also a number of civic-minded(有道德的) netizens, who recently set up a Rumor Verification Federation on https://www.wendangku.net/doc/6214613946.html,’s microblog system to help netizens identify fake inform ation online.

Dianzizheng is the team leader of the federation. He says they’ve publicized more than 150 pieces which refute(驳倒)rumors, which attracted more than 10 thousand visitors within two months.

“We live in an age of new media, so we can’t use the old methods to confirm rumors. We can’t wait for the media to identify the facts with related administrative departments and then release a formal announcement. We can’t allow rumors to run wildly and then deal with it, we need to fight rumors while they’re spreading. I think that this is the best way to deal with rumors nowadays.”

Some experts say this demonstrates the advantages of the internet compared to other

traditional media. The open platform allows information to be examined and clarified by netizens. But experts like Ding Wenguo, President of the Journalism and Communication College at the China University of Political Science and Law says this self-correction function of the internet is still quite limited.

“It’s still quite difficult to tell which information is true in such an open environment by just reading a number of different opinions on the same issue. This is something which we need to pay attention to. If society is flooded with too much false information, and it’s allowed to spread in such a fast manner, then people will be suspicious of all kinds of information including important information from authorities. It also worsens problems relating to social communications and mutual-understanding, which in turn harms society as a whole.”

Experts suggest that the government should react more quickly in the internet age. Once a rumor begins to spread, administrative departments should make announcements as early as possible to dispel rumors before they lead to bad outcomes.

72. https://www.wendangku.net/doc/6214613946.html, decided to found a specialized team to ____.

A. limit the number of microblogs.

B. advance the development of microblogs.

C. prevent the spread of rumors on the Internet.

D. urge the government to react quickly to the rumors.

73. The underlined word "fabricated" in the first paragraph can be replaced by "______".

A. dug out

B. made up

C. got round

D. given away

74. What is the best way to prove rumors on microblogs?

A. Examining and checking while they are spreading.

B. Substituting the Internet for traditionally media.

C. Shutting down the website immediately.

D. Making announcements after they are spread.

75. The writer cited Ding Wenguo's words in Paragraph 8 to ______.

A. draw a conclusion

B. support the argument

C. introduce a topic

D. describe a scene

南安侨光中学2014届高三年实验班第四次阶段考试 英语试题答题卡 第二卷(共35分) 第四部分:写作(共二节,满分35分) 第一节:短文填词 (共10小题;每小题1分,满分10分) Dear John, Last summer I took a part-time job in the International Camp for children. I have been _________(告知) one more worker 76. __________ will be needed this year, and I think you are fit _________ it. 77. __________ How about j________ us? The camp is at the foot of a small 78. __________ hill __________( 离….近) to a river. It is such a beautiful place! 79. __________ We can hear birds singing happily all a_________. In the evening, 80. __________ everybody sleeps in tents, _________ is very exciting. 81. __________ B__________ we usually work only five hours a day, we will have 82. __________ plenty of free time to v_______ the area and have fun. I am 83. __________ sure it will be an unforgettable _________( 经历) . If you have 84. __________ __________(兴趣) in it, reply to me soon. 85. __________ Yours, Li Hua 第三节 书面表达 (25分) 某城市近年每百人中手机用户增长示意图

分析:

班级_________ 姓名___________ 考号___________

根据所给图表,

1.简要描述某城市近年每百人中手机用户增长情况,

2.试分析其增长原因(列出至少两点原因),可适当延伸。

3.你对此现象的看法。

高三实验班英语第4次阶段考参考答案

一、听力理解(每题1.5%,共30%)

1-5.AACBA 6-10.BCABA 11-15.BACCA https://www.wendangku.net/doc/6214613946.html,CBA

二、单项选择(每题1%,共15%)

21 – 25. CBCDD 26-30. BBDBB 31-35. DCADB

三、完形填空(每题1.5%,共30%)

36 – 40.DADBB 41-45.BDADC 46-50.BCDCB 51-55.BDADC

四、阅读理解(每题2%,共40%)

56—https://www.wendangku.net/doc/6214613946.html,BAB 61-65.BADCA 66-70.DDDDA https://www.wendangku.net/doc/6214613946.html,BAB

五、短文填词:

76. told 77. for 78. joining 79. close 80. around

81. which 82. Because 83. visit 84. experience 85. interest

六、书面表达

From the chart above, it can be seen clearly that more and more people have mobile phones in recent years. In 1999, only twenty in a hundred had mobile phones in some cities. In 2001, the number of the people who had mobile phones was ten times as many as in 1999. In 2001, a half of the persons in a hundred had mobile phones. However, in 2006, it jumped to 80.

The following reasons can account for this tremendous change. Among them, the technology of making mobile phones is changing rapidly. In addition, people’s growing income provides them with easier and easier access to them. Besides, mobile phones are useful in people’s life, by which they can communicate with others very conveniently.

From my point of view, there are some problems remaining to be solved in people using mobile phones. A typical one is that more and more people are addicted to them too much, which in turn do much harm to their social communication with others. Therefore, necessary instructions should be given to guarantee people’s reasonable use of mobile phones.

福建省南安市侨光中学2019-2020学年八年级下学期第一次阶段考数学试题

福建省南安市侨光中学2019-2020学年八年级下学 期第一次阶段考数学试题 学校_________ 班级__________ 姓名__________ 学号__________ 一、单选题 1. 要使得分式有意义,那么应满足() A.B.C.D. 2. 如图,五角星盖住的点的坐标可能是() A.B.C.D. 3. 下列式子从左边变形到右边,能成立的是() A.B. C.D. 4. 某种计算机完成一次基本运算的时间约为0.000 000 001 s,把0.000 000 001 s用科学记数法可表示为() A.0.1×10-8 s B.0.1×10-9 s C.1×10-8 s D.1×10-9 s 5. 平行四边形不一定具有的性质是() A.两组对边分别相等B.两组对角分别相等 C.两条对角线互相平分D.两条对角线分别平分对角 6. 在同一直角坐标系中,直线与直线平行,那么值是()

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福建省南安市侨光中学2019-2020学年高二下学期第一次阶段考化学试题 Word版含解析

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【答案】A 【解析】 【分析】 最活泼的金属元素为铯(不考虑放射性元素钫),在ⅠA族,价层电子排布为:6s1; 最活泼的非金属元素为氟,在ⅦA族,价层电子排布为:2s22p5; 常温下为液态的金属是汞,在ⅦA族;价层电子排布为:5d106s2; 根据以上元素的价层电子排布结合图中的区域进行解答。 【详解】最活泼的金属元素是铯(不考虑放射性元素钫),在ⅠA族,s区;最活泼的非金属元素(是氟)在ⅦA族,p区;汞的价电子排布为5d106s2,ⅡB族,ds区;故选A。 综上所述,本题选A。 4.下列物质中,可以证明某化合物内一定存在离子键的是() A. 可溶于水 B. 水溶液能导电 C. 具有较高的熔点 D. 固体不导电,但熔融状态能导电 【答案】D 【解析】 【详解】A.可溶于水的物质不一定含有离子键,如硫酸,故A错误; B.水溶液能导电的物质不一定含有离子键,故HCl,故B错误; C.具有高熔点的物质不一定含有离子键,如二氧化硅,故C错误; D.固态不导电,但熔融状态能导电,说明该化合物熔融状态能电离出阴阳离子,含有离子键,故D正确; 故选:D。 5.下列分子中含有的电子数目与HF相同,且只有两个极性共价键的是() A. CO2 B. N2O C. H2O D. CH4 【答案】C 【解析】 【分析】 根据原子序数判断原子的电子数目,HF含有10个电子;判断共价键类型可根据成键原子是否相同,如成键的两个原子形同,则为非极性共价键;反之为极性共价键。 【详解】A. CO2中C原子的电子数为6,O原子的电子数为8,CO2分子中含有的电子数目为22;

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