高考真题全国卷下载word（全国乙卷高考数学试卷真题和答案解析[Word文字版]）_高考_解析_答案

本文目录

• 全国乙卷高考数学试卷真题和答案解析[Word文字版]
• 2018年全国一卷英语高考试卷真题及答案（附Word版下载）
• 全国甲卷高考数学试卷真题和答案解析[Word文字版]
• 全国乙卷高考英语试卷真题和答案解析[Word文字版]
• 2019年全国卷2高考数学试卷试题及答案解析（答案WORD版）

全国乙卷高考数学试卷真题和答案解析[Word文字版]

一、全国乙卷高考数学试卷真题和答案解析全国乙卷高考数学试卷真题和答案解析正在快马加鞭的整理当真，考试结束后我们第一时间发布word文字版。考生可以在线点击阅览：
五、全国乙卷高考数学试卷答案解析 （一）.2022年全国乙卷高考数学试卷试题难不难,附试卷分析和解答

（二）.2019年高考全国乙卷理科数学试卷试题答案解析（WORD下载）

（三）.2019年高考全国乙卷文科数学试卷试题答案解析（WORD下载）

（四）.2019年江西高考全国乙卷(I卷)理科数学试卷试题答案解析（WORD下载）

（五）.2019年江西高考全国乙卷(I卷)文科数学试卷试题答案解析（WORD下载）

（六）.2019年山西高考全国乙卷(I卷)理科数学试卷试题答案解析（WORD下载）

（七）.2019年山西高考全国乙卷(I卷)文科数学试卷试题答案解析（WORD下载）

（八）.2019年河北高考全国乙卷(I卷)理科数学试卷试题答案解析（WORD下载）

（九）.2019年河北高考全国乙卷(I卷)文科数学试卷试题答案解析（WORD下载）

（十）.2019年河南高考全国乙卷(I卷)理科数学试卷试题答案解析（WORD下载）
;

2018年全国一卷英语高考试卷真题及答案（附Word版下载）

第一节 （共5小题；每小题1.5分，满分7.5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。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。
例：How much is the shirt?
A. £ 19. 15. B. £ 9. 18. C. £ 9. 15.
答案是 C。

1.What will James do tomorrow ?
A.Watch a TV program. B.Give a talk. C.Write a report.

2.What can we say about the woman?
A.She’s generous. B.She’s curious. C.She’s helpful.

3.When does the train leave?
A.At 6:30. B.At 8:30. C.At 10:30.

4.How does the woman go to work?
A.By car. B.On foot. C.By bike.

5.What is the probable relationship between the speakers?
A.Classmates. B.Teacher and student. C.Doctor and patient.

第二节（共15小题；每小题1.5分，满分22.5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。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、7题。

6.What does the woman regret?
A.Giving up her research.
B.Dropping out of college.
C.Changing her major.

7.What is the woman interested in studying now?
A.Ecology. B.Education. C.Chemistry.
听第7段材料，回答第8、9题。

8.What is the man?
A.A hotel manager. B.A tour guide. C.A taxi driver.

9.What is the man doing for the woman?
A.Looking for some local foods.
B.Showing her around the seaside.
C.Offering information about a hotel.

听第8段材料，回答第10至12题。

10.Where does the conversation probably take place?
A.In an office. B.At home C.At a restaurant.

11.What will the speakers do tomorrow evening?
A.Go to a concert. B.Visit a friend. C.Work extra hours.

12.Who is Alice going to call?
A.Mike . B.Joan. C.Catherine .

听第9段材料，回答第13至16题。

13.Why does the woman meet the man?
A.To look at an apartment.
B.To deliver some furniture.
C.To have a meal together.

14.What does the woman like about the carpet?
A.Its color. B.Its design. C. Its quality .

15.What does the man say about the kitchen?
A.It’s a good size. B.It’s newly painted. C. It’s adequately equipped .

16.What will the woman probably do next?
A.Go downtown. B.Talk with her friend. C.Make payment .

听第10段材料，回答第17至20题。

17.Who is the speaker probably talking to?
A.Movie fans. B.News reporters. C.College students .

18.When did the speaker take English classes?
A.Before he left his hometown.
B.After he came to America.
C.When he was 15 years old.

19.How does the speaker feel about his teacher?
A.He’s proud. B.He’s sympathetic. C.He’s grateful .

20.What does the speaker mainly talk about ?
A.How education shaped his life.
B.How his language skills improved.
C.How he managed his business well.

第二部分 阅读理解(共两节，满分40分)

第一节 (共15小题；每小题2分，满分30分)

阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
21.Which tour do you need to book in advance?
A. Cherry Blossom Bike Tour in Washington, D.C.
B. Washington Capital Monuments Bicycle Tour.
C. Capital City Bike Tour in Washington, D.C.
D. Washington Capital Sites at Night Bicycle Tour.

22.What will you do on the Capital City Bike Tour?
A. Meet famous people. B. Go to a national park.
C. Visit well-known museums. D. Enjoy interesting stories.

23.Which of the following does the bicycle tour at night provide?
A. City maps. B. Cameras.
C. Meals. D. Safety lights.
24. What do we know about Susanna Reid?
A. She enjoys embarrassing her guests. B. She has started a new programme.
C. She dislikes working early in the morning. D. She has had a tight budget for her family.

25. How does Matt Tebbutt help Susanna?
A. He buys cooking materials for her. B. He prepares food for her kids.
C. He assists her in cooking matters. D. He invites guest families for her.

26. What does the author intend to do in paragraph 4?
A. Summarize the previous paragraphs. B. Provide some advice for the readers.
C. Add some background information. D. Introduce a new topic for discussion.

27. What can be a suitable title for the text?
A. Keeping Fit by Eating Smart B. Balancing Our Daily Diet
C. Making yourself a Perfect Chef D. Cooking Well for Less
28. What can we infer about languages in hunter-gatherer times?
A.They developed very fast. B. They were large in number.
C. They had similar patterns. D. They were closely connected.

29. Which of the following best explains“dominant “ underlined in paragraph 2？
A.Complex. B. Advanced.
C.Powerful. D.Modern.

30. How many languages are spoken by less than 6, 000 people at present?
A.About 6,800 B.About 3,400
C.About 2,400 D.About 1,200

31. What is the main idea of the text?
A. New languages will be created.
B. People’s lifestyles are reflected in languages.
C. Human development results in fewer languages.
D. Geography determines language evolution.
32. What does the author think of new devices?
A. They are environment-friendly. B. They are no better than the old.
C. They cost more to use at home. D. They go out of style quickly.

33. Why did Babbitt’s team conduct the research?
A. To reduce the cost of minerals.
B. To test the life cycle of a product.
C. To update consumers on new technology.
D. To find out electricity consumption of the devices.

34. Which of the following uses the least energy?
A. The box-set TV. B. The tablet.
C. The LCD TV. D. The desktop computer.

35. What does the text suggest people do about old electronic devices?
A. Stop using them. B. Take them apart.
C. Upgrade them. D. Recycle them.

第二节 (共5小题；每小题2分，满分10分)

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Color is fundamental in home design——something you’ll always have in every room. A grasp of how to manage color in your spaces is one of the first steps to creating rooms you’ll love to live in. Do you want a room that’s full of life? Professional? Or are you just looking for a place to relax after a long day? 36 , color is the key to making a room feel the way you want it to feel.
Over the years, there have been a number of different techniques to help designers approach this important point. 37 , they can get a little complex. But good news is that there’re really only three kinds of decisions you need to make about color in your home: the small ones, the medium ones, and the large ones.
38 . They’re the little spots of color like throw pillows ,mirrors and baskets that most of us use to add visual interest to our rooms .Less tiring than painting your walls and less expensive than buying a colorful sofa ,small color choices bring with them the significant benefit of being easily changeable .
Medium color choices are generally furniture pieces such as sofas, dinner tables or bookshelves 39 . They require a bigger commitment than smaller ones, and they have a more powerful effect on the feeling of a space.
The large color decisions in your rooms concern the walls, ceilings, and floors .Whether you’re looking at wallpaper or paint, the time, effort and relative expense put into it are significant. 40 .

A. While all of them are useful

B. Whatever you’re looking for

C. If you’re experimenting with a color

D. Small color choices are the ones we’re most familiar with

E. It’s not really a good idea to use too many small color pieces

F. So it pays to be sure, because you want to get it right the first time

G. Color choices in this range are a step up from the small ones in two major ways

第三部分　语言知识运用(共两节，满分45分)

第一节 (共20小题；每小题1.5分，满分30分)

阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

During my second year at the city college，I was told that the education department was offering a “free“course, called Thinking Chess, for three credits.I 41 the idea of taking the class because, after all ,who doesn’t want to 42 a few dollars? More than that, I’d always wanted to learn chess. And,even if I weren’t 43 enough about free credits,news about our 44 was appealing enough to me. He was an international grandmaster, which 45 I would be learning from one of the game’s 46 .I could hardly wait to 47 him.
Maurice Ashley was kind and smart, a former graduate returning to teach, and this 48 was no game for him: he meant business. In his introduction, he made it 49 that our credits would be hard-earned. In order to 50 the class ,among other criteria, we had to write a paper on how we plan to 51 what we would learn in class to our future professions and, 52 ,to our lives. I managed to get an A in that 53 and learned life lessons that have served me well beyond the 54 .
Ten years after my chess class with Ashley, I’m still putting to use what he 55 me:“The absolute most important 56 that you learn when you play chess is how to make good 57 .On every single move you have to 58 a situation ,process what your opponent(对手）is doing and 59 the best move from among all your options.”These words still ring true today in my 60 as a journalist.

41. A. put forward B. jumped at C. tried out D. turned down

42. A. waste B. earn C. save D. pay

43. A. excited B. worried C. moved D. tired

44. A. title B. competitor C. textbook D. instructor

45. A. urged B. demanded C. held D. meant

46. A. fastest B. easiest C. best D. rarest

47.A. interview B. meet C. challenge D. beat

48. A. chance B. qualification C. honor D. job

49. A. real B. perfect C. clear D. possible

50. A. attend B. pass C. skip D. observe

51. A. add B. expose C. apply D. compare

52. A. eventually B. naturally C. directly D. normally

53. A. game B. presentation C. course D. experiment

54. A. criterion B. classroom C. department D. situation

55. A. taught B. wrote C. questioned D. promised

56. A. fact B. step C. manner D. skill

57. A. grades B. decisions C. impressions D. comments

58. A. analyze B. describe C. rebuild D. control

59. A. announce B. signal C. block D. evaluate

60. A. role B. desire C. concern D. behavior

第二节（共10小题；每小题1.5分，满分15分）

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

According to a review of evidence in a medical journal, runners live three years 61 (long) than non-runners. You don’t have to run fast or for long 62 (see)the benefit. You may drink, smoke,be overweight and still reduce your risk of 63 (die) early by running. While running regularly can’t make you live forever, the review says it 64 (be) more effective at lengthening life 65 walking, cycling or swimming. Two of the authors of the review also made a study published in 2014 66 showed a mere five to 10 minutes a day of running reduced the risk of heart disease and early deaths from all 67 (cause).
The best exercise is one that you enjoy and will do. But otherwise… it’s probably running. To avoid knee pain,you can run on soft surfaces,do exercises to 68 (strength)your leg muscles(肌肉),avoid hills and get good running shoes. Running is cheap, easy and it’s always 69 (energy).If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give 70 a try.

第四部分 写作(共两节，满分35分)

第一节 短文改错（共10小题，每小题1分，满分10分）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（Λ），并在其下面写出该加的词。
删除：把多余的用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第l1处起）不计分。

During my last winter holiday, I went to countryside with my father to visit my grandparents. I find a big change there. The first time I went there, they were living in a small house with dogs, ducks, and another animals. Last winter when I went here again, they had a big separate house to raise dozens of chicken. They also had a small pond which they raised fish. My grandpa said last summer they earned quite a lot by sell the fish. I felt happily that their life had improved. At the end of our trip, I told my father that I planned to return for every two years, but he agreed.

第二节 书面表达(满分25分)

假定你是李华，你的新西兰朋友Terry将去中国朋友家做客，发邮件向你询问有关习俗。请你回复邮件。内容包括：
1. 到达时间；
2.合适的礼物；
3. 餐桌礼仪。

注意：
1. 词数100左右；
2. 可以适当增加细节，以使行文连贯。

绝密★启用前

2018年普通高等学校招生全国统一考试

英 语

1-5 BCCBA 6-10BABCC 11-15ABAAC 16-20BCBCA

21-25ADDBC 26-30CDBCB 31-35CADBA 36-40BADGF

41-45BCADD 46-50CBDCB 51-55CACBA 56-60DBADA

61.longer 62.to see 63.dying 64.is 65.than 66.that \which 67.causes

68.strengthen 69.energetic 70.it \running
During my last winter holiday, I went to countryside with my father to visit my grandparents. I a big change there. The first time I went there, they were living in a small house with dogs, ducks, and animals. Last winter when I went again, they had a big separate house to raise dozens of . They also had a small pond they raised fish. My grandpa said last summer they earned quite a lot by the fish. I felt that their life had improved. At the end of our trip, I told my father that I planned to return every two years, he agreed.

书面表达（略

全国甲卷高考数学试卷真题和答案解析[Word文字版]

一、全国甲卷高考数学试卷真题和答案解析全国甲卷高考数学试卷真题和答案解析正在快马加鞭的整理当真，考试结束后我们第一时间发布word文字版。考生可以在线点击阅览： 五、全国甲卷高考数学试卷答案解析 (1).2022年全国甲卷高考数学试卷试题难不难,附试卷分析和解答 (2).2019年吉林高考全国甲卷(2卷)理科数学试卷真题难度答案解析（WORD文字版） (3).2019年吉林高考全国甲卷(2卷)文科数学试卷真题难度答案解析（WORD文字版） (4).2019年黑龙江高考全国甲卷(2卷)理科数学试卷真题难度答案解析（WORD文字版） (5).2019年黑龙江高考全国甲卷(2卷)文科数学试卷真题难度答案解析（WORD文字版） (6).2019年贵州高考全国甲卷(2卷)理科数学试卷真题难度答案解析（WORD文字版） (7).2019年贵州高考全国甲卷(2卷)文科数学试卷真题难度答案解析（WORD文字版） (8).2019年高考全国甲卷理科数学试卷试题答案解析（WORD下载） (9).2019年高考全国甲卷文科数学试卷试题答案解析（WORD下载） ;

全国乙卷高考英语试卷真题和答案解析[Word文字版]

一、全国乙卷省高考英语试卷真题和答案解析全国乙卷省高考英语试卷真题和答案解析正在快马加鞭的整理当真，考试结束后我们第一时间发布word文字版。考生可以在线点击阅览： 五、全国乙卷高考英语试卷答案解析 (一)、2022年全国乙卷高考英语试卷试题难不难,附试卷分析和解答 (二)、2019年高考全国乙卷英语试卷试题答案解析（WORD下载） (三)、2019年江西高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (四)、2019年山西高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (五)、2019年河北高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (六)、2019年河南高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (七)、2019年广东高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (八)、2019年湖南高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (九)、2019年福建高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） (十)、2019年湖北高考全国乙卷(I卷)英语试卷试题答案解析（WORD下载） ;

2019年全国卷2高考数学试卷试题及答案解析（答案WORD版）

2015年高考全国卷2理科数学试题及答案解析（word精校版）

注意事项：

1．本试卷分第I卷（选择题）和第II卷（非选择题）两部分。答卷前，考生务必先将自己的姓名、准考证号码填写在答题卡上。

2．回答第I卷时，选出每小题的答案后，用铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其他答案标号。写在本试卷上无效。

3．回答第II卷时，将答案写在答题卡上，写在本试卷上无效。
4．考试结束后，将本试卷和答题卡一并交回。
一、选择题：本大题共12小题，每小题5分，在每小题给出的四个选项中，只有一项是符合题目要求的。

（1）已知集合A=｛-2，-1,0，1,2｝，B=｛x|（X-1）（x+2）＜0｝,则A∩B=（）

（A）｛--1,0｝（B）｛0,1｝（C）｛-1,0,1｝（D）｛,0,，1，2｝

【答案】A

【解析】由已知得
，故 ，故选A
（2）若a为实数且（2+ai）（a-2i）=-4i,则a=（）

（A）-1（B）0（C）1（D）2

【答案】B
（3）根据下面给出的2004年至2013年我国二氧化硫排放量（单位：万吨）柱形图。以下结论不正确的是()
（A）逐年比较，2008年减少二氧化硫排放量的效果最显著

（B）2007年我国治理二氧化硫排放显现

（C）2006年以来我国二氧化硫年排放量呈减少趋势

（D）2006年以来我国二氧化硫年排放量与年份正相关

【答案】D

【解析】由柱形图得，从2006年以来，我国二氧化硫排放量呈下降趋势，故年排放量与年份负相关．

（4）等比数列｛an｝满足a1=3，
=21，则 ()
（A）21（B）42（C）63（D）84

【答案】B
（5）设函数
, ()
（A）3（B）6（C）9（D）12

【答案】C

【解析】由已知得
，又 ，所以 ，故 ．
（6）一个正方体被一个平面截去一部分后，剩余部分的三视图如右图，则截去部分体积与剩余部分体积的比值为

（A）
（B） （C） （D）
【答案】D

【解析】由三视图得，在正方体
中，截去四面体 ，如图所示，，设正方体棱长为 ，则 ，故剩余几何体体积为 ，所以截去部分体积与剩余部分体积的比值为 ．
（7）过三点A（1,3），B（4,2），C（1,-7）的圆交于y轴于M、N两点，则
=
（A）2
（B）8（C）4 （D）10
【答案】C
（8）右边程序抗土的算法思路源于我国古代数学名著《九章算术》中的“更相减损术”。执行该程序框图，若输入a,b分别为14,18，则输出的a=
A.0B.2C.4D.14

【答案】B

【解析】程序在执行过程中，
， 的值依次为 ， ； ； ； ； ； ，此时 程序结束，输出 的值为2，故选B．
（9）已知A,B是球O的球面上两点，∠AOB=90,C为该球面上的动点，若三棱锥O-ABC体积的最大值为36，则球O的表面积为

A．36πB.64πC.144πD.256π

【答案】C

【解析】如图所示，当点C位于垂直于面
的直径端点时，三棱锥 的体积最大，设球 的半径为 ，此时 ，故 ，则球 的表面积为 ，故选C．
10.如图，长方形ABCD的边AB=2，BC=1，O是AB的中点，点P沿着边BC，CD与DA运动，记∠BOP=x．将动点P到A、B两点距离之和表示为x的函数f（x），则f（x）的图像大致为
【答案】B
的运动过程可以看出，轨迹关于直线 对称，且 ，且轨迹非线型，故选B．
（11）已知A，B为双曲线E的左，右顶点，点M在E上，?ABM为等腰三角形，且顶角为120°，则E的离心率为

（A）√5（B）2（C）√3（D）√2
【答案】D
（12）设函数f’(x)是奇函数
的导函数，f（-1）=0，当 时， ，则使得 成立的x的取值范围是
（A）
（B）
（C）
（D）
【答案】A

【解析】

记函数
，则 ，因为当 时， ，故当 时， ，所以 在 单调递减；又因为函数 是奇函数，故函数 是偶函数，所以 在 单调递减，且 ．当 时， ，则 ；当 时， ，则 ，综上所述，使得 成立的 的取值范围是 ，故选A．
二、填空题

（13）设向量
， 不平行，向量 与 平行，则实数 _________．
【答案】

【解析】因为向量
与 平行，所以 ，则 所以 ．
（14）若x，y满足约束条件
，则 的最大值为____________．
【答案】
（15）
的展开式中x的奇数次幂项的系数之和为32，则 __________．
【答案】

【解析】由已知得
，故 的展开式中x的奇数次幂项分别为 ， ， ， ， ，其系数之和为 ，解得 ．
（16）设
是数列 的前n项和，且 ， ，则 ________．
【答案】

【解析】由已知得
，两边同时除以 ，得 ，故数列 是以 为首项， 为公差

的等差数列，则 ，所以 ．
三．解答题

（17）?ABC中，D是BC上的点，AD平分∠BAC，?ABD是?ADC面积的2倍。

(Ⅰ)求
;
(Ⅱ)若
=1，

=

求

和

的长.
(18)某公司为了解用户对其产品的满意度，从A，B两地区分别随机调查了20个用户，得到用户对产品的满意度评分如下：

A地区：62738192958574645376

78869566977888827689
B地区：73836251914653736482

93486581745654766579

（Ⅰ）根据两组数据完成两地区用户满意度评分的茎叶图，并通过茎叶图比较两地区满意度评分的平均值及分散程度（不要求计算出具体值，得出结论即可）；

（Ⅱ）根据用户满意度评分，将用户的满意度从低到高分为三个不等级：

满意度评分

低于70分

70分到89分

不低于90分

满意度等级

不满意

满意

非常满意

记时间C：“A地区用户的满意度等级高于B地区用户的满意度等级”。假设两地区用户的评价结果相互独立。根据所给数据，以事件发生的频率作为相应事件发生的概率，求C的概率
19．（本小题满分12分）
如图，长方体ABCD—A1B1C1D1中，AB=16，BC=10，AA1=8，点E，F分别在A1B1，D1C1上，A1E=D1F=4，过点E，F的平面α与此长方体的面相交，交线围成一个正方形。

（1）在图中画出这个正方形（不必说明画法和理由）；

（2）求直线AF与平面α所成的角的正弦值。
20．（本小题满分12分）

已知椭圆C：
，直线l不过原点O且不平行于坐标轴，l与C有两个交点A，B，线段AB的中点为M。
（1）证明：直线OM的斜率与l的斜率的乘积为定值；

（2）若l过点
，延长线段OM与C交于点P，四边形OAPB能否为平行四边形？若能，求此时l的斜率；若不能，说明理由。
21．（本小题满分12分）

设函数
。
（1）证明：
在 单调递减，在 单调递增；
（2）若对于任意
，都有 ，求m的取值范围。
请考生在第22、23、24题中任选一题作答，如果多做，则按所做的第一题记分。作答时请写清题号
22．（本小题满分10分）

选修4-1：几何证明选讲

如图，O为等腰三角形ABC内一点，⊙O与ΔABC的底边BC交于M，N两点，与底边上的高AD交于点G，且与AB，AC分别相切于E，F两点。

（1）证明：EF∥BC；

（2）若AG等于⊙O的半径，且
，求四边形EBCF的面积。
23．（本小题满分10分）

选修4-4：坐标系与参数方程

在直角坐标系xOy中，曲线C1：
（t为参数，t≠0），其中0≤α《π，在以O为极点，x轴正半轴为极轴的极坐标系中，曲线C2： ，C3： 。
（1）求C2与C3交点的直角坐标；

（2）若C1与C2相交于点A，C1与C3相交于点B，求
的最大值。
24．（本小题满分10分）

选修4-5：不等式选讲

设a，b，c，d均为正数，且a+b=c+d，证明：

（1）若ab》cd；则
；
（2）
是 的充要条件。
附：全部试题答案
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