天津市耀华中学2019-2020学年高一下学期期末考试英语试题 Word版含答案

天津市耀华中学2019-2020学年度第二学期期末考试

高一年级英语学科试卷

(本试卷考试时间100分钟,总分100分）

I卷(满分75分)

I.听力（共20小题；每小题1分；满分20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。每段对话仅读一遍。

1. When can the man see the headmaster?

A. At 9:30.

B. At 11:45.

C. At 12:40.

2. Why does the man want to keep the window shut?

A. Because he is ill.

B. Because he wants to open it himself.

C. Because the air inside is fresh enough.

3. What is Mike?

A. A teacher.

B. A student.

C. A writer.

4. What has made working at home possible?

A. Personal computers.

B. Communication industry.

C. Living far from companies.

5. Where is the woman?

A. In a soap factory.

B. In her house.

C. At an information desk.

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。每段对话或独白读两遍。

听第6段材料，回答第6~7题。

6. Where does the conversation most probably take place?

A. At home.

B. On a bus.

C. In the bank.

7. Why do the two speakers want to buy a car?

A. They have a lot of money.

B.The man lives too far away from his office.

C. The woman’s office is too far away from her home.

听第7段材料，回答第8~10题。

8. Why won’t Mr. Stone come to the clinic tomorrow?

A. He can’t spare the time.

B. The clinic will be closed.

C. Dr. Milton won’t come to work.

9. When is the clinic open in a week?

A. From Monday to Friday.

B. On weekdays except Thursday.

C. During the whole week.

10. What time has finally been fixed for Mr. Stone to come?

A. 5:30 p. m., Wednesday.

B. 6:15 p. m., Wednesday.

C. 6:15 p. m., Thursday. 听第8段材料，回答第11~13题。

11. What’s the relationship between the two speakers?

A. Neighbors.

B. Doctor and patient.

C. Friends.

12. When did the woman cough most seriously?

A. In the morning.

B. In the afternoon.

C. At night.

13. What did the man do for the woman?

A. He examined the woman carefully.

B. He gave her some medicine and some advice as well.

C. He just told her not to worry too much.

听第9段材料，回答第14~16题。

14. What’s the possible relationship between the two spea kers?

A. Husband and wife.

B. Friends.

C. Strangers.

15. Where does the conversation most probably take place?

A. At the woman’s home.

B. At the man’s home.

C. In a restaurant.

16. What does the woman ask the man to do?

A. Have some soup.

B. Bring his wife next time.

C.Have more rice.

听第10段材料，回答第17~20题。

17. What did Nicholas do at eighteen months?

A. He began to learn French.

B. He read the newspaper.

C. He took telephone messages.

18. Why was Nicholas bored and unhappy at the two schools?

A. He had too much homework.

B.H e almost couldn’t learn anything special.

C. His teachers often corrected his spelling.

19. Who offered to help Nicholas finally?

A. His classmates.

B. His parents.

C. A college.

20. What is Nicholas’ life like now?

A. Busy with much social life.

B. Interesting and adventurous.

C. Full at college and free at home.

II. 单项选择（共15小题；每小题1分；满分15分）

21. --- What do you want to do next? We have half an hour until the basketball game.

--- ______. Whatever you want to do is fine with me.

A. It just depends

B. It’s totally up to you

C. That’s all right

D. Glad to hear that

22. There is an illness that can result in total blindness ______ left untreated.

A. after

B. if

C. since

D. unless

23. These mistakes are very ______ among students, so we’re not surprised if you do wrong.

A. ordinary

B. common

C. usual

D. normal

24. All around the world, we can see kids playing football to their hearts’ ______.

A. content

B. pleasure

C. satisfactory

D. attraction

25. Before seeing The Revenge of Prince Zidan, I wasn’t sure whether I ______ it. But after

experiencing it, I found I was deeply attracted by it.

A. had enjoyed

B. enjoyed

C. was enjoying

D. would enjoy

26. During the flood, there was water everywhere, but we couldn’t drink any of it, ______

we would get really sick.

A. therefore

B. however

C. otherwise

D. further

27. One of the first things that Jane did ______ getting home was to check on her kids.

A. to

B. for

C. of

D. on

28. The poor man, ______, ran out of the dark cave.

A. trembled and frightened

B. trembling and frightened

C. trembled and frightening

D. trembling and frightening

29. Although they are surrounded by reminders of the disaster, ______ effect is damaging,

they are working together to rebuild their homes and their lives.

A. whose

B. where

C. which

D. when

30. It is too cold outside, so we decided to watch television at home ______ go for a walk.

A. other than

B. more than

C. rather than

D. or rather

31. ______ it comes to speaking in public, no one can match him.

A. Since

B. When

C. Once

D. After

32. However hard I tried, I couldn’t ______ my meaning to the people around me.

A. let out

B. give away

C. get across

D. put on

33. You are waiting at a wrong place. It is at the hotel ______ the coach picks up tourists.

A. who

B. which

C. where

D. that

34. The cooling wind swept through our windows, ______ air conditioning unnecessary.

A. making

B. to make

C. made

D. being made

35. Even though we ______ a lot due to the natural disaster, moments when we could be

together with our family gave us hope for the future.

A. have lost

B. had lost

C. were losing

D. would lose

III. 完形填空(共20小题; 每小题1分; 满分20 分)

In 1989, an 8.2 earthquake almost flattened America, killing over 30,000 people in less than four minutes. In the middle of complete damage and disorder, a father rushed to the school where his son was 36 to be, only to discover that the building was completely 37 .

After the unforgettable shock, he 38 the promise he had made to his son: “No matter 39 happens, I’ll always be there for you!” And tears began to 40 his eyes. As he looked at the pile of ruins, it looked 41 , but he still remembered his promise to his son. He rushed there

and started 42 the ruins.

As he was digging, other helpless parents arrived, 43 : “It’s too late! They’re all dead!

44 , face reality, there’s nothing you can do!” To each parent h e 45 with the same words: “Are you going to help me now?” No one helped. And then he continued to dig for his son, stone by stone.

Courageously he went on alone because he needed to know 46 : “Is my boy 47 or is he dead?” He dug for eight hours… 24 hours … 36 hours… then, in 48 hour, he pulled back a large stone and heard his son’s 49 . He screamed his son’s name, “ARMAND!” He heard back, “Dad! It’s me, Dad! I told the other kids not to worry. I told them that you 50 me if you were alive and 51 you saved me, they’d be saved. You promised, ‘No matter what happens, I’ll always be there for you!’ You did it, Dad!”

“What’s going on in there?” the father asked.

“There are 14 of us 52 out of 33, Dad. We’re scared, hungry, thirsty and we’re 53 that you’re here. When the building collapsed, it made 54 , and it saved us.”

“Come out, boy!”

“No Dad! Let the other kids out first, 55 I know you’ll get me! No matter what happens, I know you’ll always be there for me!”

36. A. asked B. supposed C. ordered D. left

37. A. damaged B. disappeared C. protected D. guarded

38. A. memorized B. kept C. forgot D. remembered

39. A. how B. what C. which D. who

40. A. fill B. cover C. come D. burst

41. A. encouraging B. hopeless C. lovely D. disappointed

42. A. digging from B. digging through C. digging out D. digging into

43. A. to say B. said C. and saying D. saying

44. A. Come out B. Come again C. Come on D. Come off

45. A. responded B. told C. asked D. answered

46. A. for himself B. of himself C. in himself D. to himself

47. A. live B. living C. alive D. lively

48. A. 38 B. the 38 C. 38th D. the 38th

49. A. sound B. voice C. noise D. tone

50. A. would have saved B. would save C. save D. will save

51. A. when B. because C. even if D. though

52. A. remained B. missing C. left D. gone

53. A. regrettable B. hopeful C. thankful D. unbelievable

54. A. a promise B. a triangle (三角) C. space D. room

55. A. because B. though C. when D. even though

IV.阅读理解(共15小题; 每小题2分; 满分30分)

A

Winners Club

You choose to be a winner!

The Winners Club is a bank account specially designed for teenagers. It has been made to help you better manage your money. The Winners Club is a transaction account (交易账户) where you receive a key-card so you can get to your money 24/7--- that’s 24 hours a day, 7 days a week!

It’s a club with impressive features for te enagers:

◆No account keeping fees!

You’re no millionaire so we don’t expect you to pay large fees. In fact, there are no account keeping or transaction fees!

◆Excellent interest rates!

You want your money to grow. The Winners Club has a good rate of interest which gets even better if you make at least two deposits (储蓄) without taking them out in a month.

◆Convenient

Teenagers are busy --- we get that. You may never need to come to a bank at all. With the Winners Club you can choose to use handy tellers and to bank from home using the phone and the Internet … You c an have money directly deposited into your Winners Club account. This could be your pocket money or your pay from your part-time job!

◆Mega magazine included

Along with your regular report, you will receive a FREE magazine full of good ideas to make even more of your money. There are also fantastic offers and competitions only for Winners Club members. The Winners Club is a great choice for teenagers. And it is so easy to join. Simply fill in an application form. You will have to get permission from your parent or guardian (监护人) (so we can organize that cool key-card) but it is easy. We can’t wa i t to hear from you. It’s the best way to choose to be a winner!

56. The Winners Club is a bank account intended for ________.

A. parents

B. winners

C. teenagers

D. adults

57. Which of the following is TRUE about the Winners Club?

A. Special gifts are ready for parents.

B. The bank opens only on work days.

C. Fees are necessary for the account keeping.

D. Services are convenient for its members.

58. The Winners Club provides magazines which ________.

A. encourage spending

B. help to make more of your money

C. are full of adventure stories

D. are free to all teenagers

59. If you want to be a member of the Club, you must ________.

A. be an Internet user

B. have a big sum of money

C. be permitted by your parent

D. be in your twenties

60. What is the purpose of this text?

A. To introduce a new banking service.

B. To provide part-time jobs.

C. To organize key-cards.

D. To set up a club.

B

Jeremy Fox, a retired businessman in a small city in England, recently bought an old farmhouse with a yard and a small field, some five miles out of the town. There he planned to lead a simple life with his wife, Amelia.

It was while clearing out the old barn on the far side of the yard that he made an interesting discovery. In a corner, under some old sacks, he found some large fragments (碎片) of an antique (古董) bowl. Out of curiosity, he took them into the kitchen and, much to the anger of his wife, washed the mud off them. That evening he spread newspapers over the kitchen table and carefully stuck the fragments together. However, two pieces were found missing.

Two days later, having pulled down the barn, Mr. Fox was digging over the ground in preparation for the installation (安装) of a greenhouse, when he discovered the two missing pieces. When he had stuck them in position, the bowl looked so fine that Amelia agreed to its being placed on a table in the living room, in front of the window.

“We might have something a bit special here,” he said to his wife. A few days later, Jeremy took several photographs of the bowl, which he sent off to Sotheby’s in London.

Unexpectedly, Sotheby’s was extremely interested in the bowl and sent an expert to inspect it. It turned out that it was a Chinese Ming fish bowl, dating back to around 1500, and might be expected to get a five-figure sum at an auction.

A week later still more unexpectedly, two police officers called and told the Foxes the bowl was stolen property.

So the bowl never reached the auction room, and Mr. Fox never received the five-figure sum that had been mentioned. However, he framed one of the photographs he had taken and hung it on the wall.

61. At first Mrs. Fox seemed to be ________.

A. greatly annoyed at Mr. Fox’s enthusi asm

B. very much interested in the discovery

C. uncertain of Mr. Fox’s enthusiasm

D. curious about Mr. Fox’s findings

62. The two missing pieces happened to be found ________.

A. in the kitchen

B. in a greenhouse

C. out of the old barn

D. under the ground

63. Most likely “Sotheby’s” was ________.

A. an antique shop

B. a friend of Mr. Fox’s

C. an artist

D. a china store

64. According to the expert, the bowl could be sold at the price of ________.

A. five thousand pounds

B. less than ten thousand pounds

C. one thousand, five hundred and ninety pounds

D. at least ten thousand pounds

65. Which of the following is NOT TRUE?

A. Most probably Sotheby’s purchased the bowl in the end.

B. It turned out that Mr. Fox got neither the money nor the bowl.

C. Mr. Fox preferred country life to city life after his retirement.

D. Mr. Fox was fond of gardening.

C

Science fiction writers create imaginary worlds. The way things work in your imaginary worlds will b e based on actual science. So it’s important for you to be familiar with the scientific principles and inventions that are related to your creation. For example, if you’re writing about humans living on a planet with zero gravity, then you need to know the effects of zero gravity on the human body.

Then you have to figure out the exact rules of your imaginary worlds. And you have to follow them. If humans have evolved (进化) to breathe underwater in Chapter 1, your character can’t drown in a swimming pool in Chapter 3. If your robots write poetry but not fiction, then you can’t throw a novelist robot into Chapter 8. The issue here is maintaining your readers’ trust. That means the reader is willing to pretend along with you. If you start out with an ordinary detective novel (侦探小说) and then throw in someone breathing underwater in the 6th chapter, your readers’ reaction might be, “What the h……?” The imaginative spell is broken. You’ve pulled the readers out of their imagination. The same thing happens if you change the rules halfway.

Part of your preparation work for the novel is to map out its worlds for yourself in great detail. Decide: the history of the world, the geography, what possibilities it offers, how everything works in this new reality, and how all of these factors affect the way your characters think, feel, and react to things. You don’t have to tell your reader s all the rules in the first chapter. But you have to let your readers know enough to understand what’s going on. This also allows you to work out logical problems and contradictions (矛盾) before you start writing.

When you are writing, remember to make it feel real. You are inviting readers to visit a new world. They will want to be able to see, hear, feel, smell, and even taste what it’s like. Whether your novel is about a world without disease or an undiscovered planet, help your readers feel like they’re actually there.

66. What’s the relationship between actual science and science fiction?

A. Science fiction promotes the development of actual science.

B. Science fiction often reflects the development of actual science.

C. Actual science limits the imagination described in science fiction.

D. Actual science provides basic principles for science fiction.

67. The second paragraph is mainly developed by ________.

A. making comparisons

B. giving examples

C. following the time order

D. analyzing causes

68. Which of the following statements is TRUE?

A. It is necessary to do some scientific experiments before writing science fiction.

B. It is more difficult to write science fiction than ordinary detective novels.

C. Readers of science fiction actually pretend the writers’ rules are true.

D. It is great to leave some contradictions in your science fiction.

69. The target (目标) readers of the passage are ________.

A. young scientists

B. science fiction writers

C. college students

D. professional journalists

70. The passage is mainly about ________.

A. how to do scientific research

B. how to raise interest in science

C. what to expect from science fiction

D. how to write science fiction

II 卷（满分25分）

V. 短语填空根据句意用所给短语正确形式填空(共10小题; 每题1分; 共10分)

71.

When facing difficulties, we should always see the good side of things and ________.

72. He ________ the book and found that he was not interested in it at all.

73. When you are planning to go on an adventure, a lot of factors should be ________.

74. _______ my high-school days, I have realized they were among the happiest in my life.

75. Lauren takes every opportunity to travel to Western Australia because she ________

photography and the natural world.

76. We are now working really hard so that we can ________ our teachers’ expectations.

77. Since he didn’t ________ his first lecture, he is trying his best to prepare the second.

78. Hopefully, their experiment will ________ a cure for that disease.

79. I can’t come to any conclusion now because I ________ hear Mark’s version of what

happened.

80. When the war ________, people were terrified and tried to escaped from the town.

VI. 书面表达（15分）

当前不少文学作品被改编成电影。有人选择看电影，有人则喜欢读原著。请你以“Film or book, which do you prefer?” 为题，按照下列要点, 进行适当发挥,

写一篇英语短文：

1、看电影：省时、有趣、易懂

2、读原著：细节更多、语言优美

3、我的看法及理由

4、词数：100-120。

5、参考词汇：original work（原著）

Film or book, which do you prefer?

__________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ 天津市耀华中学2019-2020学年度第二学期期末考试

高一年级英语学科答案

I. 听力理解(每题0.5分; 满分10分)

1-20 CABBB ABCAC BCBBA BCBCC

II. 单项选择(每题1分; 满分15分)

21-35 BBBAD CDBAC BCDAB

III. 完型填空(每题1分; 满分20分)

36-55 BADBA BBDCA ACDBB ACCBA

IV. 阅读理解(每小题2分；满分30分)

A) 56-60 CDBCA B) 61-65 ADADA C) 66-70 DBCBD

V. 短语填空(每题1分; 满分10分)

71. stay positive 72. looked through 73. taken into account

74. Looking back upon 75. is keen on 76. live up to

77. succeed in 78. result in 79. have yet to 80. broke out

VI. 书面表达(15分)

One possible version:

Film or book, which do you prefer?

Some of us think that it is better to see the film than to read the book in the original. The reason is that it takes less time to understand the whole story. Besides, the film is usually more interesting, and it is easier to follow.

Some others have just the opposite opinion. They think that they can get more detailed information from the original. Meanwhile, the language in the book is possibly more lively and beautiful.

Personally, I agree with the second view. Actually I have more reasons for it. I think I can stay at home, reading quietly in a situation of my own, and what's more, I am able to better understand the author's ideas. In a word, to read the original work is better than to see the film based on it.

2019-2020学年天津耀华中学高一上学期期中数学试题(含答案解析)

2019-2020学年天津耀华中学高一上学期期中数学试题 一、单选题 1．已知集合{ } 2 |1,M y y x x R ==-∈，集合{} 2 |3N x y x ==-，M N = I （ ）． A ．{} (2,1),(2,1)-B ．[1,3]- C ．[0,3] D ．? 【答案】B 【解析】解：[1,)M =-+∞，[3,3]N =-， 故[1,3]M N ?=- 故选：B 2．下列判断正确的是（ ） A ．函数22()2 x x f x x -=-是奇函数 B ．函数1()(1) 1x f x x x +=--是偶函数 C ．函数2()1f x x x =+-是非奇非偶函数 D ．函数()1f x =既是奇函数又是偶函数 【答案】C 【解析】【详解】试题分析：A 中函数的定义域为{}|2x x ≠不关于原点对称，()f x 不是奇函数；B 中函数的定义域为{}|11x x -≤<不关于原点对称，()f x 不是偶函数；C 中函数的定义域为{} |1,1x x x ≤-≥或，2()1()f x x x f x -=-+-≠， 2()1()f x x x f x -=-+-≠-，所以()f x 是非奇非偶函数；D 中是偶函数，不是奇 函数.故选C. 【考点】函数的奇偶性. 【方法点睛】 判断函数奇偶性的方法：⑴定义法：对于函数()f x 的定义域内任意一个x ，都有 ()()f x f x -=〔或或()()0f x f x --=〕?函数()f x 是偶函数；对于

函数()f x 的定义域内任意一个x ，都有 〔或或 ?函数()f x 是奇函数；判断函数奇偶性的步骤：①判断定义域是否 关于原点对称；②比较 与()f x 的关系；③下结论.⑵图象法：图象关于原点成中 心对称的函数是奇函数；图象关于y 轴对称的函数是偶函数.⑶运算法：几个与函数奇偶性相关的结论：①奇函数+奇函数=奇函数；偶函数+偶函数=偶函数；②奇函数×奇函数=偶函数；奇函数×偶函数=奇函数；③若()f x 为偶函数，则()()()f x f x f x -==. 3．设函数2(1)()x a x a f x x +++=为奇函数，则实数a =（ ）． A ．1- B ．1 C ．0 D ．2- 【答案】A 【解析】∵函数2(1)()x a x a f x x +++=为奇函数， ∴22(1)(1)()()0x a x a x a x a f x f x x x -+++++-+=+=-， 化为(1)0a x +=， ∴10a +=，解得1a =-． 故选：A ． 4．设0x >，y R ∈，则“x y >”是“x y >”的（ ） A ．充要条件 B ．充分而不必要条件 C ．必要而不充分条件 D ．既不充分也不 必要条件 【答案】C 【解析】12>-不能推出12>-，反过来，若x y >则x y >成立，故为必要不充分条件. 5．若关于x 的不等式0ax b ->的解集为{} 1x x <，则关于x 的不等式02 ax b x +>-的解集为（ ） A ．{ 2x x <-或)1x > B ．{} 12x x << C ．{1x x <-或}2x > D ．{} 12x x -<< 【答案】D

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A. B. C. D. 4.（6分）如图，在平面直角坐标系中，⊙O 的半径为1，则直线y x 2=-与⊙O 的位置关系是（ ） A ．相离 B ．相切 C ．相交 D ．以上三种情况都有可能 5．（6分）若一直角三角形的斜边长为c ，内切圆半径是r ，则内切圆的面积与三角形面积之比是（ ） A ． B ． C ． D ． 6．（6分）如图，Rt △ABC 中，BC=，∠ACB=90°，∠A=30°， D 1是斜边AB 的中点，过D 1作D 1 E 1⊥AC 于E 1，连结BE 1交CD 1于D 2；过D 2作D 2E 2⊥AC 于E 2，连结BE 2交CD 1于D 3；过D 3作D 3E 3⊥AC 于E 3，…，如此继续，可以依次得到点E 4、E 5、…、E 2013，分别记△BCE 1、△BCE 2、△BCE 3、…、△BCE 2013的面积为S 1、S 2、S 3、…、S 2013．则S 2013的大小为（ ） A. 31003 B.320136 C.310073 D. 671 4 7．（6分）抛物线y=ax 2与直线x=1，x=2，y=1，y=2围成的正方形有公共点，则实数a 的取值范围是（ ） A ．≤a ≤1 B ．≤a ≤2 C ．≤a ≤1 D ．≤a ≤2

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天津市耀华中学2020-2021学年度第一学期期末考试 高一年级英语学科试卷 I卷（满分70分） I.听力理解（共20小题，每小题0.5分，满分10分） 第一节（共5小题，每题0.5分，共2.5分） 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。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。 1. Where does the conversation take place? A. In a supermarket. B. In a classroom. C. At home. 2. When do the speakers need to check their tickets? A. At 7:15 pm. B. At 8:30 pm, C. At 8:45 pm. 3. What does the man like to play now? A. Basketball. B. Baseball C. Tennis. 4. What does the man say about Uncle Jim? A. He works hard, B. His is often late for work. C. He speaks with his mouth full of food. 5. What are the speakers talking about? A. The price of the bed. B. The price of the fridge. C. The price of the washing machine. 第二节（共15小题，每题0.5分，共12.5分） 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。听每段对话或独白前，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。每段对话或独白读两遍。听第6段材料，回答第6至7题。 6. What color is the woman's dog? A. Black. B. Brown. C. White. 7. What is the woman doing now? A. Buying a present. B. Looking for a cat. C, Attending a party. 听第7段材料，回答第8至10题。 8. What's the probable relationship between the speakers? A. Neighbors. B. Colleagues- C. Teacher and student. 9. What month is it now? A. May. B. July. C. September. 10. What does the woman offer to do for the man? A. Type his paper B. Present his findings. C. Help do the research,

解析天津市耀华中学2021年高三第一次月考物理试题

一、单选题（每题3 分，共30 分) 1.甲乙两辆小车沿同一直线运动，速度时间图像如图所示，则（） A. 运动时甲的加速度与乙的加速度之比为４：3 B. 运动时甲的加速度与乙的加速度之比为３:4 Ｃ. 相遇前甲乙最远距离为６m Ｄ. 甲乙同时开始运动 【答案】Ｃ 【解析】 【详解】速度图象的斜率等于物体的加速度,则甲的加速度，乙的加速度：，所以运动时甲的加速度与乙的加速度之比为１：4,故AB错误;当甲乙速度相等时,相距最远,速度图象与时间轴围成的面积等于物体在该段时间内通过的位移，故C正确；由图可知,甲先运动3s后乙开始运动,故Ｄ错误。所以Ｃ正确，ABD错误。 2.有一列火车正在做匀加速直线运动．从某时刻开始计时,第1分钟内,发现火车前进了180m.第6分钟内发现火车前进了360m．则火车的加速度为( ） A. 0.01m/s2 B. 0．05m/s2 C. ３6m/ｓ2Ｄ. 18０m／s2 【答案】A 【解析】 由逐差法得x6－ｘ1＝5aT２,所以,选项A正确．

3.如图所示,质量为m的质点静止地放在半径为Ｒ的半球体上,质点与半球体间的动摩擦因数为μ,质点与球心的连线与水平地面的夹角为θ,则下列说法正确的是（) A．地面对半球体的摩擦力方向水平向左 Ｂ. 质点对半球体的压力大小为mgcosθ C．质点受摩擦力大小为μmgsinθ D．质点受摩擦力大小为mgｃｏsθ 【答案】Ｄ 【解析】 【详解】以整体为研究对象，整体处于静止状态,而水平方向不受外力，所以半球体不受地面的摩擦力，故A错误；对质点受力分析,质点受重力、支持力及摩擦力，如图所示: 在三力作用下物体处于平衡状态,则合力为零，质点对球面的压力为mｇsiｎθ，故B错误;摩擦力沿切线方向，在切线方向重力的分力与摩擦力相等，即f=mgcｏｓθ，故Ｃ错误,D正确。所以D正确，ＡＢC错误。 4.如图所示，、两物体叠放在一起,在粗糙的水平面上保持相对静止地向右做匀减速直线运动,运动过程中受到的摩擦力( ）

2019-2020学年天津市耀华中学高一上学期期末考试化学试题(解析版)

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天津市耀华中学张楠老师—Na2O与Na2O2的性质比较

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