2014年湖北武汉九年级四月调考英语(含解析)

湖北省武汉市部分学校2014届九年级四月调研测试

英语试卷

第1卷（选择题共85分）

第一部分听力部分

一、听力测试（共三节）

第一节（共5小题，每小题1分，满分5分）

听下面5个问题，每个问题后有三个答语，从题中所给的A、B、C三个选项中选出最佳选项。听完每个问题后，你都有5秒钟的时间来作答和阅读下一小题。每个问题仅读一遍。

1. A. My classmate. B. Friendly. C. Sixteen years old.

2. A. Very dirty. B. A note. C. It?s brown.

3. A. It?s fast. B. At 8:00 am. C. It?s crowded.

4. A. It?s heavy. B. Too big. C. The one on the bed.

5. A. I?m nodding. B. A lot of hair. C. Better, thanks.

第二节（共7题，每小题1分，满分7分）

听下面7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。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。

6. What is Kate?s mother?

A. A doctor.

B. A nurse.

C. A patient.

7. Where is the man?

A. In the cinema.

B. On the farm.

C. At a store.

8. How is the man going to the museum?

A. By bike.

B. On foot.

C. By bus.

9. What are the- two people?

A. Teacher and student.

B. Father and daughter.

C. Doctor and patient.

10. What does the woman think of the dress?

A. The color is a bit light.

B. The size is not OK.

C. The dress is too s hort.

11. What is the man going to do?

A. Go to swim.

B. Buy some paper.

C. Do some work.

12. What does Mary mean?

A. She agrees with the man.

B. She has a better idea.

C. She doesn?t care.

第三节（共13小题，每小题1分，满分13分）

听下面4段对话或独自，每段对话或独自后有几个小题，从题中所给的?A、B、c：三个选项中选出最佳选项。听每段对话和独自前，你将有时间阅读各个小题；每小题5，秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独自读两遍。

听下面一段材料，回答13 -15题。

13. What can we know about the woman?

A. She knew the man well.

B. She worried about the bike.

C. She repaired the bike.

14. What happened to the bike?

A. It was knocked down.

B. It was badly broken.

C. It was sold to the woman.

15. Who checked the bike?

A. Nobody did.

B. The woman did,

C. The man did.

听下面一段材料，回答16 -18题。

16. What is the woman going to do?

A. To have lunch.

B. To ask about time,

C. To buy two tables.

17. How many people will be at the restaurant?

A. Two.

B. Three.

C. Eight.

18. What is the woman?s first name?

A. Kate.

B. Rose

C. Green.

听下面一段材料，回答19 – 22题。

19. What are these two speakers mainly talking about?

A. New Year?s Day.

B. Christmas Day.

C. Chinese Spring Festival.

20. Where-do children hang their stockings?

A. Over the fireplace.

B. In the Christmas tree.

C. Beside the fireplace.

21. Who do the children think will fill their stockings?

A. Father Christmas.

B. Their parents.

C. Their friends.

22. What will David do on Christmas?

A. Study at home.

B. Watch TV.

C. Visit a foreigner?s family. 听下面一段材料，回答23 – 25题。

23. Where does Dashan study now?

A. At a university in Germany.

B. At a university in China.

C. In a Chinese school at his home city

24. When does Dashan have some difficulty understanding Chinese?

A. When talking with Chinese people.

B. When listening to Chinese talk to him.

C. When listening to Chinese talk to each other.

25. How many Chinese cities has Dashan visited?

A. Just a few.

B. Three.

C. Quite a lot.

二、选择填空（本题共15分，每小题1分）

将代表最佳答案的字母在答题卡上相应的位置涂黑。

26. – We?ll travel to different places in this summer vacation. Enjoy your trip!

- ＿＿＿＿＿＿.

A. Me, too

B. Yes, I?d love to

C. The same to you

D. Very well, thank you

27. Tom?s a taxi driver, ＿＿＿＿＿he really wants to be a singer.

A. or

B. and

C. so

D. but

28. – Do you know if Jack will drive to New York this weekend?

- Jack? Never! He ＿＿＿＿＿＿driving so far.

A. has hated

B. will hate

C. hated

D. hates

29. - A. nice shirt! A present?

- Yes, it is. My aunt ＿＿＿＿＿＿it to me for my last birthday.

A. was sending

B. had sent

C. will send

D. sent

30. – Is Mr. Smith in the office?

- No, He＿＿＿＿＿＿to the library.

A. goes

B. had gone

C. has gone

D. would go

31. – Excuse me, can I park my car here?

- Yes, you can park on ＿＿＿＿＿＿side of the street.

A. another

B. both

C. either

D. neither

32. - Oh you sound just like an Englishman.

- ＿＿＿＿＿＿, I still have trouble expressing myself.

A. Yes, you?re right

B. Well, not quite like that

C. I don?t mind

D. You?re welcome

33. – We?d better invite Tom and Kate to the party tonight.

- Yes, ＿＿＿＿＿＿? I?ll give them a call right now.

A. why

B. why not

C. what for

D. how

34. Although he failed this time, he didn?t give up and ＿＿＿＿＿＿studying hard.

A. stopped

B. continued

C. succeeded

D. finished

35. - Why are you so ＿＿＿＿＿＿, Helen?

- I thought I had lost my purse, but I didn?t. I found it in my study!

A. angry

B. happy

C. sad

D. nervous

36. - Is there any ＿＿＿＿＿＿for two chairs in the office?

- Yes, I think so.

A. ground

B. floor

C. space

D. area

37. - How was the performance last night?

- It was so good. Though it ＿＿＿＿＿＿nearly four hours, few people left early.

A. covered

B. reached

C. lasted

D. played

38. I was late for school because my alarm clock didn?t ＿＿＿＿＿＿this morning.

A. go on

B. go off

C. go away

D. go up

39. -＿＿＿＿＿＿you leave so soon?

-Yes. I have to catch my plane.

A. Can

B. Would

C. Should

D. Must

40. – What did that lady ask you just now?

- She asked me＿＿＿＿＿＿.

A. who was I waiting for

B. whether could I help her

C. how she could get to the bus stop

D. what has happened

三、完形填空（本题共15分，每小题1分）

阅读下面短文，掌握其大意，然后从41 – 55各题所给的四个选项中，选出一个最佳答案。

Luke says, “At first I was shocked that somebody would do such a thing, but then I saw Jenifer?s (41) and knew that I had to do something. I jumped up and started chasing him down the street and calling‘Thief, stop !’but nobody seemed (42) in stopping him. They were too busy staring, like it was a (43) or something. Luckily, I play soccer for the school team, so I?ve been training all year and I?m in pretty good shape, so I (44) to catch up with him on Third Avenue and knocked him down. Once he was on the (45) I sat on top of him and waited for the police to come. I know that people say you shouldn?t do that kind of thing, (46) you never know what the person can do to you, but I didn?t think about that at the time. I was too (47).”

However, Jennifer is not the only one who?s grateful for Luke?s bravery. After police had arrested(送签捕) the thief, they (48) his apartment and found over a hundred stolen cell phones and, perhaps more (49) , an address book full of names of various criminal contacts(犯罪联络)，most of whom have now been brought in for (50) as police try to break a growing ring of cell phone criminals.

Cell phone theft(盗窃)is only one of a number of technology –related crimes that police say are on the rise. Businesspeople have been told to be extra (51) with their notebook computers, which are an easy target(目标) for criminals, and new police apartments are being set up to (52) crimes. In the last week alone, the New York Police Department has (53) over six hundred calls from people relating to one of the above crimes.

Thanks to Luke?s bravery and quick thinking, Jennifer didn?t (54) one of those victims (受害者) , and she knows (55) she?s going to thank Luke - by taking him for another meal at the same Indian restaurant. This time, however, she?s going to keep her cell phone in her purse.

41. A. purse B. phone C. head D. face

42. A. pleased B. frightened C. interested D. excited

43. A. game B. movie C. story D. joke

44. A. managed B. tried C. hoped D. meant

45. A. floor B. grass C. ground D. bed

46. A. because B. so C. if D. although

47. A. nervous B. sad C. brave. D. angry

48. A. broke B. searched C. sold D. discovered

49. A. important B. common C. similar D. dangerous

50. A. questioning B. testing C. pretending D. stealing

51. A. serious B. safe C. patient D. careful

52. A. care for B. deal with C. think about D. belong to

53. A. made B. checked C. received D. refused

54. A. trouble B. offer C. become D. believe

55. A. why B. how C. when D. whether

四、阅读理解（本题共30分，每小题2分）

阅读下列短文，从每题所给四个选项中，选出一个最佳答案。

A

56. We can read the above material mostly＿＿＿＿＿＿.

A. on TV

B. in the newspaper

C. in a school report

D. in the hike factory

57. From the reading we know the shop sells＿＿＿＿＿＿.

A. only bikes

B. only the parts of bikes

C. bikes and other items

D. only car parts besides bikes

58. It?s clear that‘WILCO’refers to (指) ＿＿＿＿＿＿;

A. the boss of the main shop

B. the main shops

C. the brand of the bike

D. the summer sale

59. If you go to any of WILCO shops on Sundays, you have to＿＿＿＿＿＿.

A. call number 012223 414825

B. pay more than &69.99 for one bike

C. visit www. wilcomall@ wilco-fastlift. co. uk

D. arrive at it before 4:00 p. m.

60. In this advertisement we cannot know＿＿＿＿＿＿.

A. the information about bikes

B. the e-mail address of the main shop

C. the time the shops open on weekdays

D. whether customers can easily park at all WILCO shops

B

There is a saying, “An apple a day keeps the doctor away.” Although eating properly is important, being kind to others is also good tor your health. Studies show that people who perform kind acts are more relaxed, happier, and healthier than other people.

In one study at Arizona State University researchers, found that many volunteers experienced a sudden feeling of joy, followed by a long period of calm, after performing a kind act. This feeling, called “a help?s high” may actually help reduce stress (压力) as the body releases (释放) naturally painkillers.

Stress can cause? serious health problems, and heart depression, and .sleeping problems. However, the study found that volunteers had fewer *stress-related health problems when they did helpful things for other people.

The study also found that people who did nice things for others felt better about themselves as well. They had higher self-esteem (自尊), and were? happier. Many believe this is because volunteers spend more of their time with other people. People who are more outgoing are often healthier.

Another study at the University of Michigan?s Survey Research Center confirmed the health benefits of volunteering.

A ten-year study showed that people who volunteered live longer than those who didn?t. Although you shouldn?t need a reason to be helpful, it is nice to know that kindness may help you live longer.

61. The reading is mainly about ＿＿＿＿＿＿.

A. healthy people are kind because they have more energy

B. one has to eat an apple every day to become healthy

C. kind people can be stressed because they are always helping

D. doing kind things can make you feel good and help you he healthier

62. According to the reading ＿＿＿＿＿＿.

A. it is better to be kind than to eat well

B. kindness can help you feel healthy

C. an apple a day can keep doctors away

D. eating correctly makes one happy and healthy

63. You can get a help?s high ＿＿＿＿＿＿.

A. by volunteering your time

B. by taking painkillers

C. by eating properly

D. by sleeping well

64. The study found that people who help others can have ＿＿＿＿＿＿.

A. sleeping problems and stress

B. less natural painkillers

C. overeating and depression problems

D. fewer health problems

65. Another study of almost 3 ,000 men showed that people who volunteered ＿＿＿＿＿.

A. lived longer

B. needed a reason to be helpful

C. wanted to live longer

D. had lower self-esteem

C

Sarah ran in, shouting, “Look what I found!”Over the top of the paper I was reading; came a terrible thing that caused me to jump. It was a snake skin found in our garden.

“Isn?t it beautiful?” said my seven-year-old daughter.

I opened my eyes widely and looked at the snake skin in fear. I didn?t think it was beautiful, but I learned never to appear nonchalant(冷漠的)with children. Everything they see for the first time is important to their sense of beauty; they see only excellence in the world.

“Why does it do this?”Sarah asked.

“Snakes shed(蜕) their skins because they need to renew themselves,” I explained.

“Why do they need to renew themselves?” Sarah asked.

“We often need to shed our skins, those coatings that we cover ourselves with,” I said to my daughter. “We leave some things and find other thing unwanted or unnecessary. This snake no longer needs this skin. It is probably too little for him, and he probably doesn?t think he looks as smart in it as he once did. “

As we talked, I knew that she began to understand. Although she couldn?t understand clearly, she would know that renewal is part of progress; that we need to take a good look at ourselves, our rooms, schoolwork and spirit, and see what we need to keep and what we need to leave. I was careful to tell that this is a natural way, not one to be forced.

“Snakes don?t peel off their skins when they like them. “I explained. “It happens as a natural thing of their growth. ““I see, Dad,” said Sarah as she held the snake skin, and then ran off.

I hoped she would remember this; we need to throw some away because they are worthless or unnecessary. Then we can store them as memories m our deep hearts.

66. Father jumped up when her daughter came to him with a snake skin because ＿＿＿＿＿＿.

A. he didn?t want to read any more

B. he was in great fear of it

C. he wanted to praised her daughter

D. he hated snakes

67. Father?s patient explanation shows that ＿＿＿＿＿＿.

A. his daughter didn?t want to listen to him at all

B. he knew children saw only excellence in the world

C. his daughter couldn?t follow him at all

D. he wanted to teach everything to her

68. In this reading the underlined word …renew? means ＿＿＿＿＿＿.

A. to begin to do something again

B. to make something newer than before

C. to replace something old with something new

D. to cover something old with something new

69. We learn from the reading that＿＿＿＿＿＿.

A. the girl seemed to understand what her father said

B. the girl wasn?t interested in the explanation

C. the father was good at raising snakes

D. the father liked the snake skin better

70. Which of the following titles is the best for the reading?

A. Snake Skin

B. Renew Ourselves

C. Father and Girl

D. Great Discovery

第Ⅱ卷（非选择题共35分）

五、词与短语选择填空（本题共10分，每小题2分）

仔细阅读下面五个句子，然后用下面方框中所给的单词或短语填空，使每个句子在结构、句义和逻辑上正确。（提示：选项中有一个是多余的。）

71. The best way to improve your English is to ＿＿＿an English club.

72. Be quiet please, class. I?m going to__ your test papers.

73. Mr. Tan makes the best noodle in town. They?re _____!

74. There?s a ＿＿smell in the house. Do you know what it is?

75. Could you ＿＿＿me with information about student exchange programs?

六、阅读理解填词（本题共10分，每小题1分）

先阅读短文，再在其后空白处写出各单词的正确形式。单词的第一个字母已给出。

In 1993, Greg Mortenson took a trip to Pakistan to climb K2, the second tallest mountain in the world. On his way down the mountain, he got l (76). Food and water were hard to find, but Mr. Mortenson found a small village. The people there saw that he was in n (77) and helped him. While in the village, Mr. Mortenson w(78) the children write in the dirt for their school l(79)．The village did not have money to build a school or pay for a t(80)，Before he left, Mr.，Mortenson volunteered to r( 81) to the village and help them build a school

Mr. Mortenson went back to the US and wrote to many rich people. He asked them to d (82) money to build a bridge and a school for the village. The I (83) did not work very well, but at last e (84) people heard about Mr. Mortenson?s plan and helped him. That was the beginning of the Central Asia Institute, an organization that has succeeded in building or helping to build more than 130 schools in small villages in Pakistan and Afghanistan With the help of journalist David Relin, Mr. Mortenson wrote the famous book Three Cups of Tea. It is about his work with villages in Pakistan and Afghanistan. Some people have criticized him, however, Mr. Mortenson was given a p(85) in 2009 by the government of Pakistan for his work in the country.

七、书面表达（本大题15分）

假如你是李明。

明天是周六，你给汉口某校的外教史密斯打电话，邀请他到武昌游玩。

内容要点如下：

1．乘2号线地铁到洪山广场，你们在那里见面；

2．明天会很热，轻装；

3．穿运动鞋，游东湖，爬山；

4．请你补充交代一两件事。

要求：

1.不要逐条翻译，内容要连贯。

2.词数：60-800 ．

参考词汇：the subway（地铁）square （广场）sports shoes （运动鞋）

电话开头和结束语已给出：

Is Smith there? Hi, this is Li Ming.-I?d like to invite you to Wuchang to get relaxed tomorrow.

See you tomorrow.

参考答案

一、听力测试

1-5ABBCC 6-10 BCACB 11-15 CBBAC 16-20 ACBBA 21-25 ACBCC

二、选择填空

26-30C DDDC 31- 35 CBBBB 36-40 CCBDC

三、完形填空

41-45B CBAC 46-50 ADBAA 51-55 DBCCB

四、阅读理解

56-60B CBDC 61-65 DBADA 66-70 BBCAB

五、词与短语选择填空

71. join 72. give out 73. delicious 74. strange 75. provide

六、阅读理解填词

76. lost 77. need 78. watch 79. lessons 80. teacher 81. return 82. donates 83.ideas 84.enough

85.prizes

七、书面表达

As you know, the famous East Lake is very beautiful in China. I?d like to show you around it. Then we will climb Moshan. We will walk a lot, so you?d better wear your sports shoes. You take the No 2 subway to Hongshan Square at about 8 tomorrow morning. I will meet you there. And it seems to be very hot tomorrow, don?t wear too much. By the way, don?t forget you camera.

参考答案解析

单项填空

26. 考查情景交际用语。祝对方假期愉快的同时，对方也祝福自己假期愉快，故选C。

27. 考查连词。身份是出租车司机，但却想成为歌手，故选D。

28. 考查动词时态。根据前句中的关键词never可以得知Jack现在的惯常性的爱好并不是开车，故选D。

29. 考查动词时态。根据时间状语for my last birthday可以得知，故选D。

30. 考查动词时态，Mr. Smith不在办公室，说明他已经出去了，故选C。

31. 考查不定代词。由于是肯定回答，同意开车的人在街道的任意一边停车，故选C。

32. 考查情景交际用语。你的口音听起来像英国人，回答者说自己还没有达到那个程度，通过后句我还是在表达上有些吃力得知，故选B。

33. 考查交际用语。同意对方的观点，故选B。

34. 考查非谓语。根据前句提到他尽管失败了，但是他没有放弃，故选B。

35. 考查形容词，根据答句说在书房里发现了钱包，所以很开心，故选B。

36. 考查名词。句中指是否有空间为办公室添置两张椅子，故选C。

37. 考查动词。根据后句中提到的几乎没有人提前离场得知，故选C。

38. 考查动词短语。go off指（闹钟）响了，故符合句意。go on指持续；go away指离开；go up指上涨，均不符合句意。

39. 考查情态动词。must在句中指“非得”的含义，故选D。

40. 考查宾语从句。根据宾语从句的时态保持一致和从句应用陈述语序得知，故选C。

完形填空

41. Luke说他看见了Jennifer的手机被小偷盯上了，于是他必须要采取点行动，故选B。

42.每个人似乎没有兴趣阻止小偷，而是盯着看，故选C。

43. 那些亲眼目睹者把Luke追小偷的场景当作电影来欣赏，故选B。

44. Luke在足球队训练的经历让他成功抓住了小偷，故选A。

45. 当小偷栽倒在地上，Luke就骑在小偷身上等警察来，故选C。

46. 许多人劝Luke别好管闲事，因为你不知道对方会做出何种过激的反应，故选A。

47. Luke说他当时没有想过，因为他非常的生气，故选D。

48. 指代前句中的thief，故选B。

49. 同上句形成递进关系，故选A。

50. 电话薄上许多犯罪联系人被传讯审问，故选A。

51. 警察告知商人要尤其注意自己的手提电脑，它们极有可能成为罪犯关注的目标，故选D。

52. 新建警局是为了应对不断增长的犯罪活动，故选B。care for指照顾；think about指考虑；belong to指属于，均不符合题意。

53. 举个例子说纽约警局接到跟手提电脑被窃有关的电话多达600个，故选C。

54. 由于Luke的英勇行为，Jennifer的手机最终没有被小偷偷走，故选C。

55. Jennifer明白该如何感谢Luke, 故选B。

阅读理解

A篇

56. 考查事实细节题。这则广告应该是截取自报纸，故选B。

57. 考查事实细节题。根据报纸上的关键词wheels和twist grip以及配图上的自行车得知，故选C。

58. 考查词义推断题。Wilco是自行车售卖店, 故选B。

59. 考查事实细节题。根据广告中的这句话open Sundays 9:30am to 4:00pm得知，故选D。

60. 考查事实细节题。报纸中没有提到平时营业的时间，故选C。

B篇

61. 考查主旨大意题。首段引出people who perform kind acts are more relaxed, happier, and healthier than other people.这个主题句，接着通过两个研究来证明这个主题句，故选D。

62. 考查事实细节题。根据两个研究发现得知，故选B。

63. 考查事实细节题。根据第二段第一句many volunteers experienced a sudden feeling of joy, followed by a long period of calm, after performing a kind act. This feeling, called “a help?s high”

得知，故选A。

64. 考查事实细节题。根据第三段第二句volunteers had fewer *stress-related health problems when they did helpful things for other people.得知，故选D。

65. 考查事实细节题。根据第五段第二句A ten-year study showed that people who volunteered live longer than those who didn?t.得知，故选A。

C篇

66. 考查事实细节题。根据第一段第二句Over the top of the paper I was reading; came a terrible thing that caused me to jump. It was a snake skin found in our garden.得知父亲非常害怕，故选B。

67. 考查事实细节题，根据第三段最后一句Everything they see for the first time is important to their sense of beauty; they see only excellence in the world.得知，故选B。

68. 考查词义推断题。renew是一个增加前缀的动词，new本身是形容词，指新的，添加前缀re-表示再，符合句意，故选C。

69. 考查事实细节题。通过第10段“I see, Dad,” said Sarah as she held the snake skin, and then ran off.得知，故选A。

70. 考查主旨大意题。蛇的蜕变象征着不断成长和改变，故选B。

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卷型：A 武汉市2015届高中毕业生四月调研测试 理科综合试卷物理部分 武汉市教育科学研究院命制2015.3.29 二、选择题：本题共8小题，每小题6分。在每小题给出的四个选项中，第14～18题只有一项符合题目要求，第19～21题有多项符合题目要求。全部选对的得6分，选对但不全的得3分，有选错的得0分。 14．在水平地面上的O点同时将甲、乙两块小石头斜向上抛出，甲、乙在同一竖直面内运动，其轨迹如图所示，A点是两轨迹在空中的交点，甲、乙运动的最大高度相同。若不计空气阻力，则下列判断正确的是（C） A．甲先到达最大高度处 B．乙先到达最大高度处 C．乙先到达A点 D．甲先到达水平地面 15．17世纪，英国天文学家哈雷跟踪过一颗彗星，他算出这颗彗星轨道的半长轴约等于地球公转半径的18倍，并预言这颗彗星将每隔一定的时间飞临地球，后来哈雷的预言得到证实，该彗星被命名为哈雷彗星。哈雷彗星围绕太阳公转的轨道是一个非常扁的椭圆，如图所示。从公元前240年起，哈雷彗星每次回归，中国均有记录。它最近一次回归的时间是1986年。从公元前240年至今，我国关于哈雷彗星回归记录的次数，最合理的是（B） A．24次 B．30次 C．124次 D．319次 16．甲、乙两质点同时沿同一直线运动，速度随时间变化的v－t图象如图所示。关于两质点的运动 情况，下列说法正确的是（D） A．在t =0时，甲、乙的运动方向相同 B．在0~t0内，乙的加速度先增大后减小 C．在0~2t0内，乙的平均速度等于甲的平均速度 D．若甲、乙从同一位置出发，则t0时刻相距最远

17．心电图仪是将心肌收缩产生的脉动转化为电压脉冲的仪器，其输出部分可以等效为虚线框内的交流电源和定值电阻R0串联，如图所示。心电图仪与一理想变压器的原线圈连接，一可变电阻R与该变压器的副线圈连接。在交流电源的电压有效值U0不变的情况下，将可变电阻R的阻值调大的过 程中（C） A．通过原线圈的电流不变，通过副线圈的电流不变 B．通过原线圈的电流不变，通过副线圈的电流变小 C．通过原线圈的电流变小，通过副线圈的电流变小 D．通过原线圈的电流变大，通过副线圈的电流变大 18．如图所示，边长为L的菱形由两个等边三角形abd和bcd构成，在三角形abd内存在垂直纸面向外的磁感应强度为B的匀强磁场，在三角形bcd内存在垂直纸面向里的磁感应强度也为B的匀强磁场。一个边长为L的等边三角形导线框efg在纸面内向右匀速穿过磁场，顶点e始终在直线ab上，底边gf始终与直线dc重合。规定逆时针方向为电流的正方向，在导线框通过磁场的过程中，感应电流随位移变化的图象是（A） 19．如图所示，在匀强磁场中（磁场方向没有画出）固定一倾角为30°的光滑斜面，一根质量为m 的通电直导线垂直于纸面水平放置在斜面上，直导线恰好能保持静止，电流方向垂直于纸面向里，已知直导线受到的安培力和重力大小相等，斜面对直导线的支持力大小可能是（重力加速度大小为g）（AD） A．0 B．mg C mg D 20．两点电荷q1、q2固定在x轴上，在+x轴上每一点的电势 随x变化的关系如图所示，其中x=x0