文档库 最新最全的文档下载
当前位置:文档库 › 人教版高中英语必修三unit3测试卷

人教版高中英语必修三unit3测试卷

人教版高中英语必修三unit3测试卷
人教版高中英语必修三unit3测试卷

人教版高中英语必修三unit3测试卷

一、单项填空(共15小题;每小题1分,满分15分)

1. — Do you mind if I use your English dictionary?

— ______.

A. No, go ahead

B. Sure, please do

C. Yes, of course not

D. No, you may not

2. It was thought to be ______ adventure for him to walk across ______ Sahara Desert alone.

A. an; the

B. the, /

C. /; the

D. an; a

3. You need to have ______ if you want to teach the group of naughty children well.

A. energy

B. patience

C. strength

D. belief

4. When Tom realized that he was ______ by the teacher, he stopped cheating in the exam.

A. praised

B. recognized

C. spotted

D. glared

5. I enjoy going to the movies. But ______ the theatre, I prefer staying at home.

A. as far as

B. as for

C. as long as

D. as well

6. Maria is absent. That’s ______ she was hurt while dancing last night.

A. because

B. whether

C. why

D. when

7. I’d like to eat out, but ______ I should be trying to save money.

A. now and then

B. for one thing

C. on the contrary

D. on the other hand

8. One of the teachers ______, sat down and started talking to me.

A. came up

B. rang up

C. brought up

D. held up

9. Wang Fei is a famous singer and actress, but she is ______ as a singer.

A. more-known

B. better-known

C. well-known

D. most-known

10. I don’t want to be Black’s partner any longer. He’s always ______ fault with me.

A. finding out

B. searching

C. staring at

D. finding

11. Seeing the happy ______ of the mother and her baby playing on the grassland, I immediately took a picture of them.

A. view

B. scene

C. look

D. sight

12. I didn’t do it ______ — it was an accident.

A. on purpose

B. in a hurry

C. as usual

D. by accident

13. I don’t doubt ______ for the journey by doing jobs on the ship.

A. that he can pay

B. whether he can pay

C. that can he pay

D. whether can he pay

14. You always ______ us to do this or that, but you never do what you say you will.

A. hope

B. permit

C. let

D. promise

15. The teacher was worried about the boys in her class, for they spent ______ time playing computer games.

A. large amount of

B. a large number of

C. a large amount of

D. large numbers of

二、完形填空 (共20小题;每小题1.5分,满分30分)

At the age of 12, Jeremy was only in Grade Two. He was born with a slow 16 , seemingly unable to learn. His teacher, Doris Miller, became 17 with him. 18 , she decided to try some more.

When spring came, Doris told the children the story of Jesus. Then she gave 19 of them a box, and asked them to put something inside that 20 new life.

The next morning, it was time to 21 the boxes. In the first box, Doris found a flower. “Oh yes, a (an) 22 is certainly a sign of new life,” she said. “When it grows through the

23 , we know that spring is coming.”The next box contained a plastic butterfly, which 24 very real. “We all know that a caterpillar (毛虫) 25 into a beautiful butterfly. Yes, that is new life, too.”

Then Doris opened the third box, and was 26 to find nothing! 27 it must be Jeremy’s, she thought. And obviously Jeremy had not 28 her instructions. She felt very 29 for not having 30 the “task” to him. She did not want to make Jeremy feel ashamed, 31 she quietly set the box aside and 32 for another.

Suddenly Jeremy said, “Miss Miller, aren’t you going to talk about my box?” Doris replied, “But Jeremy, your box is 33 !” He looked into her eyes and said softly, “Yes, but so was Jesus’tomb! You told us that he brought new life.” Doris was so 34 that she couldn’t speak. Jeremy remembered 35 she had told them.

16. A. mood B. mind C. progress D. growth

17. A. satisfied B. friendly C. strict D. impatient

18. A. However B. Besides C. Thus D. But

19. A. all B. both C. none D. each

20. A. enjoyed B. knew C. showed D. hated

21. A. open B. move C. repair D. use

22. A. plant B. tree C. animal D. baby

23. A. sky B. ground C. water D. stone

24. A. looked B. smelt C. sounded D. felt

25. A. walks B. breaks C. changes D. falls

26. A. happy B. excited C. surprised D. nervous

27. A. Likely B. Surely C. Nearly D. Impossibly

28. A. heard B. liked C. forgotten D. understood

29. A. regretful B. angry C. puzzled D. comfortable

30. A. told B. given C. explained D. related

31. A. but B. so C. because D. though

32. A. reached B. care C. search D. prepare

33. A. clear B. empty C. small D. dirty

34. A. pleased B. worried C. shocked D. delighted

35. A. nothing B. anything C. something D. everything

三、阅读理解(共20小题;每小题2分,满分40分)

A

It was dark. As John was walking on his way home, he suddenly found an ugly old man staring at him.

The old man said, “Son, why don’t you get a book? It will keep you company.”

John noticed all the books the old man had were related to the super nature (超自然界). Trying to act bravely, he found one and the old man said, “T hat’s an interesting book. I t’s $25.”

The old man kept staring at John, which almost frightened him. He quickly searched his pockets and found $25.

John quickly paid for it. Then the old man called out, “W hatever happens, don’t turn to the last page. Do remember, or you will regret it!”

Reaching home, John heard his parents talking about a strange old book seller that appeared only at night during a full moon and then disappeared. Nervously, he ran straight to his

room.

At midnight, as he was sound asleep in bed, a blast (股) of cold wind blew in through the window and woke him up. He looked at his table and saw the book. For a while, he was frozen in fear, but he was so curious. Slowly he got out of bed and carefully picked up the book.

As he took a look at the last page, he cried out and fainted (晕倒).

This is what he read on the last page!

Retail (零售) Price: $10.99

Promotional (促销) Price: $2.99

36. How did John feel when he saw the old man?

A. Frightened.

B. Regretful.

C. Delighted.

D. Comfortable.

37. Why did John buy the book?

A. He was interested in the super nature.

B. He wanted to have a company.

C. He wanted to help the old man.

D. He tried to act to be brave.

38. When did John turn to the last page of the book?

A. Immediately after he bought it.

B. When he was talking with his parents.

C. When he read to the last page of the book.

D. After he was woken up at midnight.

39. What can we learn from the passage?

A. The old man had magic power.

B. John was overcharged for the book.

C. John was a really brave person.

D. The book was very interesting.

B

My name is Laura. At the age of 35, I decided to work on the plane against the will (意愿) of my children. After my first plane ride at the age of five, I felt so excited that I had a dream of earning my wings on the plane. I didn’t earn much, but I loved my job.

We were flying from Los Angeles to Washington, D.C, when I answered a call. Then I went to the cabin (客舱), I found a young mother struggling with her baby son.

She told me that she had no more diapers (尿布). With the saddest eyes I have ever seen, she continued. She said she had two babies, but she could no longer support two of them. She was taking her son to a family in New Hampshire.

As she stood in front of me, crying, I could see the hopelessness on her face. I went away and got some diapers from the other mothers, and gave her a sweater of mine. After the woman and her son had changed their clothes, I sat with her, holding her hand, trying to provide some support and comfort. I could feel her pain and her love for her baby son. During that time, I kept thinking of my children who were waiting for me in New York.

Once we landed, I walked with them to their next flight, which would take them to their final destination (目的地). The woman thanked me a lot, and I replied, “Thank you, too.”

40. What can we learn about Laura from the first paragraph?

A. She wanted to live an exciting life.

B. It was her dream to fly in the sky.

C. Her children agreed with her decision.

D. She liked her new job because of its high pay.

41. Laura’s job on the plane was to ____.

A. help the pilot manage the airplane

B. help the passengers when they were in trouble

C. help the passengers adventure by plane

D. ensure the safety of the airplane

42. Which was the mother and son’s final destination?

A. New York.

B. Los Angeles.

C. Washington,

D.C. D. New Hampshire.

43. Why did the author thank the young woman?

A. She had helped a lot when the author was in trouble.

B. She provided support and comfort for the author.

C. She made the author realize a mother’s love for the children.

D. She made the author see the importance of her work.

C

For 40 years, people in London have been happy to see parakeets (马尾鹦鹉) in their parks. The shocking green body and long tail have brought a bright color to the parks, which have attracted a lot of people.

However, the parakeets are no longer welcome. They will push out local birds from trees to build their own nests, and will also take most of the food in the parks, such as seeds, fruit and nuts.

Sometimes by accident, plants and animals are carried to new places. They are transported by trains, ships or even planes. Often, animals like fishes get transported in the water containers of ships. When these ships reach new places and pump out the water from their tanks, these animals will start a new life in a new place.

Sometimes people take plants and animals from one part of the world to the other to solve a problem. But it will create a bigger problem. Years ago, the sugarcane(甘蔗) farmers of northern Australia brought the toads (蟾蜍) from South America to their farms. They thought they would kill the beetles (甲虫) that harm the sugarcane crops. But the toad has done much more. It is now killing Australia’s native animals, such as snakes, water birds and so on.

44. People get interested in parakeets mainly because of ____.

A. their appearance

B. their singing

C. their behavior

D. their living environment

45. How do the parakeets affect the local birds?

A. They sometimes kill the local birds.

B. They destroy trees which the local birds live in.

C. They take the local birds’ nests and food.

D. They have attracted much of people’s attention.

46. What is the third paragraph mainly talking about?

A. How animals and plants come to new lands.

B. How a new animal affects the local animals.

C. Why some plants are introduced to a new place.

D. The role of ships in transporting animals and plants.

47. What can we learn about the toads?

A. They didn’t kill the beetles at all.

B. They were brought to Australia by accident.

C. They have ruined the sugarcane crops.

D. They have created a larger problem in Australia.

D

Imagine when you are sailing an ocean for the first time, you see a big fish swimming near your ship. You might be scared, and worried about whether it will turn over your ship for a meal. In fact, it is not a fish at all, but a gentle giant whale.

Whales are not fishes but mammals (哺乳动物). Their body temperature stays the same, and does not change with the temperature of their environment. They breathe air, so they have to come out of the water to get oxygen. Thus, they cannot afford to fall into a sleeping state for too long, since they need to be awake in order to breathe. It is thought that only half of their brains sleep at a time, so that whales are never completely asleep. Females give birth to the young. They have hair. Although they are not covered in hair or fur like many mammals, whales have some bristles (胡子), usually on their heads.

Whales are highly social animals with complex languages and intelligence. They communicate with each other using romantic sounds, called “whale songs”. Being so large and powerful, these sounds are also loud.

Whales are endangered as a result of whaling(捕鲸) from the eleventh century to the twentieth. It has attracted the attention of environmentalists and some measures (措施) have been taken to protect whales.

48. How many aspects show that whales are mammals?

A. One.

B. Two.

C. Three.

D. Four.

49. We can infer from the second paragraph that ____.

A. whales can breathe in the water

B. if a whale sleeps too long, it will get drowned

C. in order to breathe, whales never sleep

D. whales give birth to the young on the land

50. How do whales communicate with each other?

A. By body language.

B. By speaking languages.

C. By making song-like sounds.

D. By giving off a smell.

51. Which of the following is TRUE according to the passage?

A. Whales are cold-blooded mammals like fishes.

B. Whales are hunted for food by people.

C. Whales are very harmful to human beings.

D. Whales are in danger because of being killed by people.

E

Hugging (拥抱) is very common in western countries. It makes people feel warm and sweet. However, a school in New Hampshire has recently banned (禁止) its pupils from giving each other hugs in the classroom or on the playground. The headmaster, Mrs. Lawlor, says that the friendly greeting may be used to bully (欺负) pupils at school.

When questioned on the matter, Mrs. Lawlor replied, “This is something that has swept the entire school in the last month or two. As you know, most of our pupils are girls. It could not only be frightening but also intrusive (冒昧的).”

The school girls were asked not to say anything on this matter. We spoke to the former

caretaker (临时看管人), Mr. Peter File, who said, “I was fired by the school recently, so I have no problem giving an interview on the matter. The young girls are a lovely bunch of people and I found it no problem at all seeing them hugging closely with each other. In fact it brought a lump to my throat and a tear to my eye whenever I saw it happening on the playground. I was hugged by the girls a couple of times which made me feel warm inside.”

We have been unable to confirm why Mr. File has been removed from the post of caretaker. The school has refused to make any further statement on this matter.

52. What does the underlined word “This” refer to in the second paragraph?

A. Hugging made people feel warm and sweet.

B. Pupils were banned to give each other hugs.

C. Hugging was used to bully others.

D. Girls hugged each other in classroom.

53. What’s t he author’s attitude towards the rule of the school?

A. Oppositive.

B. Doubtful.

C. Optimistic.

D. Satisfied.

54. What did the underlined sentence in the third paragraph mean?

A. He was moved by the girls’ action.

B. He felt ashamed for himself.

C. He was sad to be unfairly treated.

D. He was happy to be hugged.

55. We can infer from the passage that the author is most probably ____.

A. a reporter

B. a teacher

C. a student

D. a parent

四、书面表达(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)

短文中共有10处错误,错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏词符号(∧),并在此符号下面写出该加的词。

删除:把多余的词用斜线( \ )划掉。

修改:在错的词下划一横线,并在该词的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11处起)不计分。

After school I went home for the supper. When I got home, I found my mother lie in bed. She was ill. My father was away from home for business. “What shall I do?” I thought to me. Since Mother was ill, I must take well care of her. So I decided to try cooking by myself. I did the cooking with great difficult and it got burnt at last. I had thought Mother would never like it. So I had to ask my mother to have supper. With my joy, Mother praised me for the meal I cooked. She said, “It tastes delicious.I’m very pleased with it.” I know that Mother was encouraging me to do much by myself.

第二节书面表达(满分25分)

假如你在一个国际聊天室里碰到一位外国朋友,他向你询问关于你所在的城市的情况。请你写一篇英语短文,向他描述一下你所在的城市。词数:100词左右。

人教版高中英语必修三unit3测试卷

参考答案:

1-15 AABCB ADABD BAADC

16-35 BDADC AABAC CBDAC BABCD

36-55 ADDBB BDCAC ADDBC DCAAA

After school I went home for supper. When I got home, I found my mother lie in bed. She

lying

was ill. My father was away from home for business. “What shall I do?” I thought to me. Since

on myself Mother was ill, I must take well care of her. So I decided to try cooking by myself. I did the

good

cooking with great difficult and it got burnt at last. I had thought Mother would never like it. So I difficulty But had to ask my mother to have supper. With my joy, Mother praised me for the meal I∧cooked. She

To had

said, “It tastes delicious. I’m very pleased with it.” I know that Mother was encouraging me to do much by myself.

more

One possible version:

I live in Beijing, the capital of China. We can see many modern and traditional buildings here.

Beijing has a history of over 3,000 years and a population of 16 million. There are many places of interests, such as the Great Wall and the Summer Palace. It has become a tourist destination for many foreigners. In 2008, the Beijing Olympic Games successfully drew attention from the world. The Beijing National Stadium, also known as the Bird’s Nest and the beautiful Water Cube have been honored as wonders in the world construction art history.

I love Beijing and I am really proud of her.

人教版高中数学必修三第二章单元测试(二)及参考答案

2018-2019学年必修三第二章训练卷 统计(二) 注意事项: 1.答题前,先将自己的姓名、准考证号填写在试题卷和答题卡上,并将准考证号条形码粘贴在答题卡上的指定位置。 2.选择题的作答:每小题选出答案后,用2B 铅笔把答题卡上对应题目的答案标号涂黑,写在试题卷、草稿纸和答题卡上的非答题区域均无效。 3.非选择题的作答:用签字笔直接答在答题卡上对应的答题区域内。写在试题卷、草稿纸和答题卡上的非答题区域均无效。 4.考试结束后,请将本试题卷和答题卡一并上交。 一、选择题(本大题共12个小题,每小题5分,共60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x ,y 是两个变量,下列四个散点图中,x ,y 是负相关趋势的是( ) A. B. C. D. 2.一组数据中的每一个数据都乘以2,再减去80,得到一组新数据,若求得新的数据的平均数是1.2,方差是4.4,则原来数据的平均数和方差分别是( ) A.40.6,1.1 B.48.8,4.4 C.81.2,44.4 D.78.8,75.6 3.某篮球队甲、乙两名运动员练习罚球,每人练习10组,每组罚球40个.命中个数的茎叶图如右图,则下面结论中错误的一个是( ) A.甲的极差是29 B.乙的众数是21 C.甲罚球命中率比乙高 D .甲的中位数是24 4.某学院A ,B ,C 三个专业共有1200名学生,为了调查这些学生勤工俭学的情况,拟采用分层抽样的方法抽取一个容量为120的样本.已知该学院的A 专业有380名学生,B 专业有420名学生,则在该学院的C 专业应抽取的学生人数为( ) A.30 B.40 C.50 D.60 5.在一次歌手大奖赛上,七位评委为某歌手打出的分数如下:9.4、8.4、9.4、9.9、9.6、9.4、9.7,去掉一个最高分和一个最低分后,所剩数据的平均值和方差分别为( ) A.9.4,0.484 B.9.4,0.016 C.9.5,0.04 D.9.5,0.016 6.两个变量之间的相关关系是一种( ) A.确定性关系 B.线性关系 C.非确定性关系 D.非线性关系 7.如果在一次实验中,测得(x ,y )的四组数值分别是A (1,3),B (2,3.8),C (3,5.2),D (4,6),则y 与x 之间的回归直线方程是( ) A.y =x +1.9 B.y =1.04x +1.9 C.y =0.95x +1.04 D.y =1.05x -0.9 8.现要完成下列3项抽样调查: ①从10盒酸奶中抽取3盒进行食品卫生检查. ②科技报告厅有32排,每排有40个座位,有一次报告会恰好坐满了听众,报告会结束后,为了听取意见,需要请32名听众进行座谈. ③东方中学共有160名教职工,其中一般教师120名,行政人员16名,后勤人员24名.为了了解教职工对学校在校务公开方面的意见,拟抽取一个容量为20的样本. 较为合理的抽样方法是( ) A.①简单随机抽样,②系统抽样,③分层抽样 B.①简单随机抽样,②分层抽样,③系统抽样 C.①系统抽样,②简单随机抽样,③分层抽样 D.①分层抽样,②系统抽样,③简单随机抽样 9.从存放号码分别为1,2,…,10的卡片的盒子中,有放回地取100次,每次取一张卡片并记下号码,统计结果如下: 此卷只装 订 不 密 封 班级 姓名 准考证号 考场号 座位号

高中生物必修三第一单元测试题

高二生物必修三第一单元试卷 一、单项选择题(每小题只有一个选项最符合题意,每小题2分,共50分) 1、与人体细胞直接进行物质交换的是 ( ) A .体液 B .细胞内液 C .消化液 D .细胞外液 2、下列有关内环境的说法中不正确的是( ) A .血浆渗透压的大小主要与无机盐和蛋白质的含量有关 B .内环境中含量最多的成分是蛋白质 C .正常人血浆的PH 稳定在7.35-7.45之间,与内环境中含有的HCO 3-、HPO 42-等离子有关 D .人体细胞外液的温度一般维持在在37O C 左右,即人体的正常体温 3、人体发生花粉等过敏反应时,引起毛细血管壁的通透性增加,血浆蛋白渗出,会造成局部( ) A .组织液增加 B .组织液减少 C .血浆量增加 D .淋巴减少 4、下图是人体局部内环境示意图,以下关于A 液、B 液和C 液三者之间联系表达正确的一项是( ) 5、食物中过多的酸性物质被肠道吸收进入血液后,血浆的PH 不会发生大的变化。其主要原因是( ) A .与血浆中的强碱中和 B .形成Na 2CO 3排出体外 C .H 2CO 3 / NaHCO 3等缓冲物质的调节作用 D .很快排出体内 6、碘是甲状腺激素的组成成分,当食物中缺碘时,分泌量增加的激素是( ) A .促甲状腺激素 B .甲状腺激素 C .胰岛素 D .生长激素 7、如果某人的下丘脑受到损伤,则可能导致 ( ) ① 体温调节能力下降 ②调节血糖的能力下降

③影响抗利尿激素的合成④影响渴觉的形成 A.①②③ B.①② C.③④ D.①②③④ 8、当人体的一些组织器官损伤或发生炎症时,会产生并释放组织胺。该物质使 毛细血管舒张和通透性增加,促进血浆渗入组织间隙而形成组织液,造成组织水 肿。该物质对血管的调节方式属于( ) A.血流自动调节 B.神经调节 C.体液调节 D.神经体液调节 9、当人处于炎热环境时,会引起 ( ) A.冷觉感受器兴奋 B.温觉感受器抑制 C.甲状腺激素分泌量增加 D.下丘脑体温调节中枢兴奋 10、某人因为交通事故脊髓从胸部折断了,一般情况下( ) A、膝跳反射存在,针刺足部无感觉 B、膝跳反射不存在,针刺足部有感觉 C、膝跳反射不存在,针刺足部无感觉 D、膝跳反射存在,针刺足部有感觉 11、神经调节的特点是 ( ) A.比较缓慢 B.比较广泛 C.时间比较长 D.迅速准确 12、当人所处的环境温度从25 ℃降至5 ℃,耗氧量、尿量、抗利尿激素及体内 酶活性的变化依次为( ) A.增加、增加、减少、降低B.增加、减少、增加、不变 C.增加、增加、减少、不变D.减少、减少、增加、不变 13、某种病毒已侵入人体细胞内,机体免疫系统对该靶细胞发挥的免疫作用是 ( ) A.体液免疫 B.自身免疫 C.细胞免疫 D.非特异性免疫 14、下图为人体内体温与水平衡调节的示意图,下列叙述正确的是( ) ①当受到寒冷刺激时,a、b、c、d激素的分泌均会增加 ②c、d激素分泌增多,可促进骨骼肌与内脏代谢活动增强,产热量增加 ③下丘脑体温调节的中枢,也是形成冷觉、热觉的部位

人教版高中英语必修三测试题与答案

人教版高中英语必修三测试题及答案本试卷分第Ⅰ卷和第Ⅱ卷两部分。卷Ⅰ第 ) 分30共两节,满分(听力第一部分第一节) 分7.5分,满分1.5小题;每小题5共(C、B、A段对话。每段对话后有一个小题,从题中所给的5听下面三个选秒钟的10你都有听完每段对话后,并标在试卷的相应位置。项中选出最佳选项,时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 What can be inferred? .1 The man is expecting the telephone. .A The man doesn't usually get calls at this time. .B The man doesn't believe the woman. .C Why does the woman call Henry a dreamer? .2 He has too many dreams. .A He likes to sleep. .B He doesn't put his idea into practice. .C How does the woman feel about the final exam? .3 Confident. .B so.-Just so.A Disappointed. .C What does the woman offer to do for the man? .4 Give him a map. .A Give him a ride. .B Show him another route. .C What is the man going to do? .5 Talk to more soldiers. .A Organize the information. .B Collect more information. .C ) 分22.5分,满分1.5

苏教版高中数学必修三第6章统计(含单元测试)参考答案

必修3第6章统计参考答案 6.1.1简单随机抽样 1.C2.C3.A4.抽签法,随机数表法,向上、向下、向左、向右 5. 21 6.60,30 7.相等,N n 8.略 9.(1)不是简单随机抽样,由于被抽取样本的总体的个数是无限的而不是有限的。 (2)不是简单随机抽样,由于它是放回抽样 10.选法二不是抽签法,因为抽签法要求所有的签编号互不相同,而选法二中39个白球无法相互区分。这两种选法相同之处在于每名学生被选中的概率都相等,等于40 1。 6.1.2系统抽样 1.A2.B3.B4.B5.A 、B 、D 6.2004 50 7.(一)简单随机抽样 (1) 将每一个人编一个号由0001至1003; (2) 制作大小相同的号签并写上号码; (3) 放入一个大容器,均匀搅拌; (4) 依次抽取10个号签

具有这十个编号的人组成一个样本。 (二)系统抽样 (1)将每一个人编一个号由0001至1003; (2)选用随机数表法找3个号,将这3个人排除; (3)重新编号0001至1000; (4)在编号为0001至0100中用简单随机抽样法抽得一个号L; (5)按编号将:L,100+L,…,900+L共10个号选出。 这10个号所对应的人组成样本。 8.系统抽样适用于总体中的个体数较多的情况;系统抽样与简单随机抽样之间存在着密切联系,即在将总体中的个体均分后的每一段进行抽样时,采用的是简单随机抽样;与简单随机抽样相同的是,系统抽样也属于等可能抽样。 9.是用系统抽样的方法确定的三等奖号码的,共有100个。 10.略(参考第7小题) 6.1.3分层抽样 Nm 1.B2.B3.1044. n 5.70,80 6.系统抽样,100个 7.总体中的个体个数较多,差异不明显; 总体由差异明显的几部分组成 中年:200人;青年:120人;老年:80人 8.分层抽样,简单随机抽样 9.因为总体共有彩电3000台,数量较大,所以不宜采用简单随机抽样,又由于三种彩电的进货数量差异较大,故也不宜用系统方法,而以分层抽样为妥。康佳:38台;海信:16台;熊猫:6台。其中抽取康佳,海信,熊猫彩电的时候可用系统抽样的方法 如果商场进的货是“康佳”“长虹”和“TCL”彩电,因为三者所占的市场分额差异不大,因此可以采用系统抽样法,具体方法略。 6.2.1频率分布表 1.C2.C3.A4.55.1206.0.47.0.148.略 9.频率分布表为:

【创新设计】高中数学(人教版必修三)配套练习:第一章 单元检测 B卷(含答案解析)

第一章算法初步(B) (时间:120分钟满分:150分) 一、选择题(本大题共12小题,每小题5分,共60分) 1.将两个数a=8,b=17交换,使a=17,b=8,下面语句正确一组是() 2.运行如下的程序,输出结果为() A.32 B.33 C.61 D.63 3.表达算法的基本逻辑结构不包括() A.顺序结构B.条件结构 C.循环结构D.计算结构 4.设计一个计算1×2×3×…×10的值的算法时,下面说法正确的是() A.只需一个累乘变量和一个计数变量 B.累乘变量初始值设为0 C.计数变量的值不能为1 D.画程序框图只需循环结构即可 5.阅读下边的程序框图,运行相应的程序,则输出s的值为()

A.-1 B.0 C.1 D.3 6.计算机执行下面的程序段后,输出的结果是() A.1,3 B.4,1 C. 7.给出30个数:1,2,4,7,11,…,其规律是第一个数是1,第二个数比第一个数大1, 第三个数比第二个数大2,第四个数比第三个数大3,……依此类推,要计算这30个数 的和,现已知给出了该问题的程序框图如图所示.那么框图中判断框①处和执行框②处 应分别填入() A.i≤30?;p=p+i-1 B.i≤29?;p=p+i-1 C.i≤31?;p=p+i D.i≤30?;p=p+i 8.当x=5,y=-20时,下面程序运行后输出的结果为()

A.22,-22 B.22,22 C.12,-12 D.-12,12 9.阅读如图所示的程序框图,运行相应的程序,输出的结果是() A.2 B.4 C.8 D.16 10.读程序 当输出的y的范围大于1() A.(-∞,-1)

最新高中英语必修三测试题全套及答案

最新高中英语必修三测试题全套及答案 (人教新课标) Unit 1 单元测试题 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,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。 A Walk into the California home of Anne Belles and her husband, Jim Silcock, and you?ll see kids everywhere playing video games, doing homework, and getting ready for dinner. There are 30 boys in this house and Anne Belles is their mom. Belles has wanted to help children since she was a kid. “I was intrigued by the movie Oliver! in the 1960s, a musical based on the Charles Dickens novel Oliver Twist. I told my mom, …That?s what I want to do. …” Anne?s boys are from 3 to 25 years old. All of them are challenged in some way. “They each have special needs — physically, mentally (精神上), or at school,” says Belles. Every day, a small army of childcare workers, nurses, and volunteers comes in to help cook and clean, wash 30 loads of laundry a day, and take care of health needs. To find out how much such a large family costs, we followed Jim Silcock to the grocery store. He spent $880 on food for one week. Every month they spend $2,000 to run five cars, $15,000 for the fourteen paid helpers, and more than $10,000 on medical costs. The family receives $26,000 a month from the state government, and makes some money from a family business. All the money is spent on the children; having new clothes and fancy cars isn?t important to Belles. How do the kids feel? 17-year-old Anthony says, “The family is there whenever I need something ... I feel like I am loved.” “Everything I?m doing now is what I wanted to happen in my life,” says Anne Belles. “So, no regrets; this is perfect. I couldn?t ask for it to be better — maybe a bigger house, you know, would be nice.” 21. The underlined word “intrigued” in the first paragraph means “_____”. A. fooled B. attracted C. frightened D. disappointed 22. The boys Anne has raised _____. A. are all ready to accept a challenge B. all like Oliver Twist C. all have disabilities

必修三第二章统计单元测试题及答案

必修三统计试题 一、选择题(每小题5分,共60分) 1.①某学校高二年级共有526人,为了调查学生每天用于休息的时间,决定抽取10%的学生进行调查;②一次数学月考中,某班有10人在100分以上,32人在90~100分,12人低于90分,现从中抽取9人了解有关情况;③运动会工作人员为参加4×100 m 接力赛的6支队伍安排跑道.就这三件事,恰当的抽样方法分别为( ) A .分层抽样、分层抽样、简单随机抽样 B .系统抽样、系统抽样、简单随机抽样 C .分层抽样、简单随机抽样、简单随机抽样 D .系统抽样、分层抽样、简单随机抽样 2. 某单位有840名职工,现采用系统抽样方法抽取42人做问卷调查,将840人按1,2,…,840随机编号,则抽取的42人中,编号落入区间[]481,720的人数为 ( ) A .11 B .12 C .13 D .14 3从2007名学生中选取50名参加全国数学联赛,若采用下面的方法选取:先用简单随机抽样从2007人中剔除7人,剩下的2000人再按系统抽样的方法抽取,则每人入选的可能性( ) A .不全相等 B .均不相等 C .都相等,且为140 D .都相等,且为50 2007 4. 某大学数学系共有学生5 000人,其中一、二、三、四年级的人数比为4∶3∶2∶1,要 用分层抽样的方法从数学系所有学生中抽取一个容量为200的样本,则应抽取三年级的学生人数为( ) A.80 B.40 C.60 D.20 5.下列数字特征一定是数据组中数据的是( ) A .众数 B .中位数 C .标准差 D .平均数 6.某公司10位员工的月工资(单位:元)为1234,,,x x x x ,其均值和方差分别为x 和2 s ,若从下月起每位员工的月工资增加100元,则这10位员工下月工资的均值和方差分别为 ( ) A.2,s 100x + B. 22+100,s 100 x + C.2 ,s x D.2 +100,s x 7.一组数据中的每一个数据都乘以2,再减去80,得到一组新数据,若求得新的数据的平均数是1.2,方差是4.4,则原来数据的平均数和方差分别是( ) A .40.6,1.1 B .48.8,4.4 C .81.2,44.4 D .78.8,75.6 8.如图所示的茎叶图记录了甲、乙两组各5名工人某日的产量数据(单位:件).若这两组数据的中位数相等,且平均值也相等,则x 和y 的值分别为( ). A.3和5 B.5和5 C.3和7 D.5和7 9.如果在一次实验中,测得(x ,y )的四组数值分别是A (1,3),B (2,3.8),C (3,5.2),

人教版高中数学必修三第一章单元测试(一)- Word版含答案

2018-2019学年必修三第一章训练卷 算法初步(一) 注意事项: 1.答题前,先将自己的姓名、准考证号填写在试题卷和答题卡上,并将准考证号条形码粘贴在答题卡上的指定位置。 2.选择题的作答:每小题选出答案后,用2B 铅笔把答题卡上对应题目的答案标号涂黑,写在试题卷、草稿纸和答题卡上的非答题区域均无效。 3.非选择题的作答:用签字笔直接答在答题卡上对应的答题区域内。写在试题卷、草稿纸和答题卡上的非答题区域均无效。 4.考试结束后,请将本试题卷和答题卡一并上交。 一、选择题(本大题共12个小题,每小题5分,共60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.小明中午放学回家自己煮面条吃,有下面几道工序:①洗锅盛水2分钟;②洗菜6分钟;③准备面条及佐料2分钟;④用锅把水烧开10分钟;⑤煮面条和菜共3分钟.以上各道工序,除了④之外,一次只能进行一道工序.小明要将面条煮好,最少要用( ) A .13分钟 B .14分钟 C .15分钟 D .23分钟 2.如图给出了一个程序框图,其作用是输入x 值,输出相应的y 值,若要使输入的x 值与输出的y 值相等,则这样的x 值有( ) A .1个 B .2个 C .3个 D .4个 3.已知变量a ,b 已被赋值,要交换a 、b 的值,采用的算法是( ) A .a =b ,b =a B .a =c ,b =a ,c =b C .a =c ,b =a ,c =a D .c =a ,a =b ,b =c 4.阅读下图所示的程序框图,运行相应的程序,输出的结果是( ) A .1 B .2 C .3 D .4 5.给出程序如下图所示,若该程序执行的结果是3,则输入的x 值是( ) INPUT IF THEN =ELSE =END IF PRINT END x x y x y x y >0- A .3 B .-3 C .3或-3 D .0 6.下列给出的输入语句、输出语句和赋值语句: (1)输出语句INPUT a ,b ,c (2)输入语句INPUT x =3 (3)赋值语句3=A (4)赋值语句A =B =C 则其中正确的个数是( ) A .0个 B .1个 C .2个 D .3个 7.执行如图所示的程序框图,若输入的a 为2,则输出的a 值是( ) 此卷 只 装订 不密封 班级 姓名 准考证号 考场号 座位号

人教版高中英语必修三Unit1综合技能测试

高中英语学习材料 (灿若寒星*制作整理) Unit 1 综合技能测试 时间:90分钟,满分:100分 Ⅰ.单项填空(每小题1分,满分15分) 1.—Will you stay for lunch? —Sorry, ________. My brother is coming to see me. A.I mustn't B.I can't C.I needn't D.I won't 答案:B根据后半句可知“不能留下吃饭”。mustn't“不允许、禁止”;can't“客观上不能办到”;needn't“不需要”;won't“不会,不愿意”。本题易误选D项,I won't只考虑了将来时。 2.It's Dad's birthday and we're going out for a meal to______. A.congratulate B.celebrate C.win D.defend 答案:B celebrate“庆祝”,其宾语常常是物而不是人。而congratulate“庆贺”的表达是congratulate sb on sth/doing sth; win“赢得”,其宾语常是a game/match/victory等;defend“保卫/护”。 3.He wrote the poem________his wife who offered her life in defense of the country. A.thanks to B.in place of C.in memory of D.because of 答案:C句意:他写这首诗是为了纪念因卫国而献出生命的妻子。in memory of“纪念……”,为固定搭配。thanks to“多亏”;in place of“代替”;because of是一个介词短语,表示“因为”。A、B、D三项不符合句意。 4.If anything________to the patient, let me know at once, please. A.happens B.will happen C.takes place D.will take place 答案:A在条件状语从句中,用一般现在时代替一般将来时,故排除B、D两项;happen 表示偶然发生,take place强调发生的事情是有计划或有安排的。 5.It's wrong for us to play tricks________our parents. A.with B.on C.to D.at 答案:B句意:跟我们的父母开玩笑是不对的。play tricks on sb“戏弄某人;开某人的玩笑”,为固定搭配。 6.The letter reminds me________the good time we had spent together. A.in B.of C.about D.on 答案:B句意:这封信使我想起了我们一起度过的快乐时刻。remind sb of/about sth“提醒某人某事”,为固定搭配。 7.________was quite obvious________they had no desire for peace. A.It; that B.What; it C.That; what D.They; it 答案:A常用句式:it is obvious that...表示“很显然”,it作形式主语,真正的主语是后面的that从句。 8.He can________his breath under the water for five minutes. A.keep B.hold

英语高中人教必修三试卷

必修三测试卷 本试卷分第一卷(选择题)和第二卷(非选择题)两部分。满分150分。 考试时间120分钟。 第Ⅰ卷(选择题共100分) 第一部分听力(共两节,满分30分) 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,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。 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,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。 A Wonderful MOVIE!!! The Ant Bully Actor: Julia Boberts-Hova ( voice )Nicolas Cage-Zoc ( voice ) Language: English Run Time: 1 Hour 25 Minutes Price: Mon.- Fri. - $30 ( VIP: $18 ) $15 ( Children under 7 ) Sat.- Sun. -$40 ( VIP: $28 ) $20 ( Children under 7 ) Lucas Nickle is often bullied(欺负) by the big boy in his neighborhood. Because he cannot fight back, he takes out his anger on an anthill(蚁丘) in his front yard. He stomps(践踏) it, squirts(喷射) it with his water gun, and floods it. One ant named Zoc makes Lucas as little as an ant and Lucas has to work and live in the ants' country. During his stay with the ants, Lucas learns the value of friendship and teamwork, and finally gains the things he wants most: friendship and the courage to stand up for himself. Comments(评论): I really enjoyed this movie. It's a fun movie for the whole family. I had really good laughs and enjoyed being there. –James I went to see this film today with my 8-year-old daughter, really without knowing too much about it. My daughter and I were pleasantly surprised at how funny it was. We just couldn't help laughing. I would recommend this film to the whole family. –Mary I have seen several movies of this kind, like Antz or Bugs Life, but this one blows them both away as having greater movie qualities. The film is so well made-some of the scenes are unbelievably beautiful.

新人教版数学必修三第一章测试题(有答案)学习资料

本章测评(时间:90分钟满分:100分) 一、选择题(本大题共10小题,每小题5分,共50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下列说法中不正确 ...的是( ). A.系统抽样是先将差异明显的总体分成几个小组,再进行抽取 B.分层抽样是将差异明显的几部分组成的总体分成几层,然后进行抽取 C.简单随机抽样是从个体无差异且个数较少的总体中逐个抽取个体 D.系统抽样是从个体无差异且个数较多的总体中,将总体均分,再按事先确定的规则在 各部分抽取 解析:当总体中个体差异明显时,用分层抽样;当总体中个体无差异且个数较多时,用系 统抽样;当总体中个体无差异且个数较少时,用简单随机抽样.所以A项中的叙述不正确. 答案:A

2某班的60名同学已编号1,2,3, (60) 为了解该班同学的作业情况,老师收取了号码能被5整除的12名同学的作业本,这里运用的抽样方法是( ). A.简单随机抽样 B.系统抽样 C.分层抽样 D.抽签法 解析:抽出的号码是5,10,15,…,60,符合系统抽样的特点:“等距抽样”. 答案:B 3统计某校1 000名学生的数学测试成绩,得到样本频率分布直方图如图所示,若满分为100分,规定不低于60分为及格,则及格率是( ).

A.20% B.25% C.6% D.80% 解析:从左至右,后四个小矩形的面积和等于及格率,则及格率是 1-10(0.005+0.015)=0.8=80%. 答案:D 4两个相关变量满足如下关系: 两变量的回归直线方程为( ). A.=0.58x+997.1 B.=0.63x-231.2

C.=50.2x+501.4 D.=60.4x+400.7 解析:利用公式==0.58, =- =997.1. 则回归直线方程为=0.58x+997.1. 答案:A 5某市A,B,C三个区共有高中学生20 000人,其中A区高中学生7 000人,现采用分层抽样的方法从这三个区所有高中学生中抽取一个容量为600的样本进行“学习兴趣”调查,则在A区应抽取( ). A.200人 B.205人 C.210人 D.215人 解析:抽样比是=,则在A区应抽×7 000=210(人). 答案:C

高中英语必修三单元测试题

Unit 2 Healthy eating 第Ⅰ卷 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,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。 A Sundays, I walk to the supermarket. Mother hands me the grocery list and puts money in my pocket, hoping it will be enough. She's had a hard day, and I've had a hard week. Nothing out of the ordinary happens when I get to the store. I grab the bread, some milk, and other things on the list. As I turn to head out, I see a beautiful dress in the window. I turn away, bitter that I could never own such a dress. Outside, I cannot stop thinking about that pretty dress. It's not fair that I can never have what I want. I work so hard to help my family and yet I get nothing in return, just another list to do. In my anger, I fail to realize the apples are rolling across the road. Suddenly, I see a pair of hands, offering me an apple. Looking up, I see the tanned (晒黑的) face of this stranger. His clothes are mismatched, borrowed or stolen. But his eyes are soft and kind. “Thanks,” I say. No other words are spok en as he continues to help me. I tell him “thank you” one more time and am on my way because I have many other things to finish. Suddenly, he says, “Have a good day, ma'am.” And then he gives me the biggest smile I have ever seen. Right then, he looks years younger — and I feel a fool.

人教版数学必修三-第二章-统计-单元测试

第二章 必修三统计单元测试 一、选择题(本大题共12小题,每小题5分,共60分) 1.从某年级1 000名学生中抽取125名学生进行体重的统计分析,就这个问题来说,下列说法正确的是( ) A .1 000名学生是总体 B .每个被抽查的学生是个体 C .抽查的125名学生的体重是一个样本 D .抽取的125名学生的体重是样本容量 2.由小到大排列的一组数据x 1,x 2,x 3,x 4,x 5,其中每个数据都小于-1,那么对于样本1,x 1,-x 2,x 3,- x 4,x 5的中位数可以表示为( ) A.12(1+x 2) B.12(x 2-x 1) C.12(1+x 5) D.1 2 (x 3-x 4) 3.某单位有老年人27人,中年人54人,青年人81人,为了调查他们的身体状况的某项指标,需从他们中间抽取一个容量为36的样本,则老年人、中年人、青年人分别应抽取的人数是( ) A .7,11,19 B .6,12,18 C .6,13,17 D .7,12,17 4.对变量x ,y 有观测数据(x i ,y i )(i =1,2,…,10),得散点图1;对变量u ,v 有观测数据(u i ,v i )(i =1,2,…,10),得散点图2.由这两个散点图可以判断( ) A .变量x 与y 正相关,u 与v 正相关 B .变量x 与y 正相关,u 与v 负相关 C .变量x 与y 负相关,u 与v 正相关 D .变量x 与y 负相关,u 与v 负相关 5.已知一组数据x 1,x 2,x 3,x 4,x 5的平均数是2,方差是1 3 ,那么另一组数3x 1-2,3x 2-2,3x 3-2,3x 4-2,3x 5-2 的平均数,方差分别是( ) A .2,13 B .2,1 C .4,2 3 D .4,3 6.某学院有4个饲养房,分别养有18,54,24,48只白鼠供实验用.某项实验需抽取24只白鼠,你认为最合适的抽样方法是( ) A .在每个饲养房各抽取6只 B .把所有白鼠都加上编有不同号码的颈圈,用随机抽样法确定24只 C .从4个饲养房分别抽取3,9,4,8只 D .先确定这4个饲养房应分别抽取3,9,4,8只,再由各饲养房自己加号码颈圈,用简单随机抽样的方法确定 7.下列有关线性回归的说法,不正确的是( ) A .相关关系的两个变量不一定是因果关系 B .散点图能直观地反映数据的相关程度 C .回归直线最能代表线性相关的两个变量之间的关系 D .任一组数据都有回归直线方程 8.已知施肥量与水稻产量之间的回归直线方程为y ^ =4.75x +257,则施肥量x =30时,对产量y 的估计值为( ) A .398.5 B .399.5 C .400 D .400.5 9.在发生某公共卫生事件期间,有专业机构认为该事件在一段时间内没有发生大规模群体感染的标志为“连续10天,每天新增疑似病例不超过7人”.根据过去10天甲、乙、丙、丁四地新增疑似病例数据,一定符合该标志的是( ) A .甲地:总体均值为3,中位数为4 B .乙地:总体均值为1,总体方差大于0 C .丙地:中位数为2,众数为3 D .丁地:总体均值为2,总体方差为3 10.某高中在校学生2 000人,高一与高二人数相同并都比高三多1人.为了响应“阳光体育运动”号召,学校举行了“元旦”跑步和登山比赛活动.每人都参加而且只参与了其中一项比赛,各年级参与比赛人数情况如下表:

精选-必修三 第一章 单元综合测试

单元综合测评(一) 时间:90分钟分值:100分 读某行政区域的空间结构图,回答1~2题。 1.关于该区域的描述正确的是() A.具有一定界线但界线是不确定的 B.有一定功能 C.具有独立性,不会对其他区域造成影响 D.内部存在差异性,与周边区域具有连续性 解析:题干中已经告诉我们是某行政区域,因此该区域具有明确的界线;具有一定功能性;具有独立性,但区域不是封闭的,而是与其他区域相互联系和交流的。 答案:B 2.从区域空间分布形式看,下列判断正确的是() A.a可能表示城市B.b可能是城市群 C.d可能是公路D.c可能为农业区 解析:从区域空间分布形式上看:d可能是公路,因为d呈线状分布;a可能是农业区,原因是面积较大,距交通线远;c可能是城市

群,看其形态是大城市的周围分布着小城市,因为此处位于交通干线的交会处,交通便捷,人口集聚,经济发达;b可能表示城市,分布在交通线附近,而且分布较均匀。 答案:C 区域是地球表面的空间单位,它是人们在地理差异的基础上,按照一定的指标和方法划分出来的,据此并结合“中国四大地理区域示意图”,分析完成3~5题。 3.关于中国四大地理区域的叙述,正确的是() A.四大地理区域之间都有明确的界线 B.西北内陆区与青藏高原区之间有明显的相似性和连续性 C.西北内陆区与青藏高原区之间有显著的差异性 D.四大地理区域独立存在,一个区域的发展变化不会影响其他地区 解析:中国四大地理区域之间的界线是模糊的;区域内部表现出明显的相似性和连续性,区域之间则具有显著的差异性;区域之间是相互联系的,一个区域的发展变化会影响到周边和相关地区。 答案:C 4.我国东部地区以秦岭—淮河为分界线,南方地区与北方地区的主要差异表现在() A.工业结构:南重北轻 B.平原面积:南大北小 C.煤炭石油:南多北少

人教版高中英语必修三测试题及答案

人教版高中英语必修三测试题及答案 本试卷分第Ⅰ卷和第Ⅱ卷两部分。 第Ⅰ卷 第一部分听力(共两节,满分30分) 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,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.What can be inferred? A.The man is expecting the telephone. B.The man doesn't usually get calls at this time. C.The man doesn't believe the woman. 2.Why does the woman call Henry a dreamer? A.He has too many dreams. B.He likes to sleep. C.He doesn't put his idea into practice. 3.How does the woman feel about the final exam? A.Just so-so.B.Confident. C.Disappointed. 4.What does the woman offer to do for the man? A.Give him a map. B.Give him a ride. C.Show him another route. 5.What is the man going to do? A.Talk to more soldiers. B.Organize the information. C.Collect more information. 第二节(共15小题;每小题1.5分,满分22.5分)

人教版数学必修三统计单元测试

第二章必修三统计单元测试 一、选择题(本大题共12小题,每小题5分,共60分) 1.从某年级1 000名学生中抽取125名学生进行体重的统计分析,就这个问题来说,下列说法正确的是() A.1 000名学生是总体 B.每个被抽查的学生是个体 C.抽查的125名学生的体重是一个样本 D.抽取的125名学生的体重是样本容量 2.由小到大排列的一组数据x1,x2,x3,x4,x5,其中每个数据都小于-1,那么对于样本1,x1,-x2,x3,- x4,x5的中位数可以表示为() A.1 2(1+x2) B. 1 2(x2-x1) C. 1 2(1+x5) D. 1 2(x3-x4) 3.某单位有老年人27人,中年人54人,青年人81人,为了调查他们的身体状况的某项指标,需从他们中间抽取一个容量为36的样本,则老年人、中年人、青年人分别应抽取的人数是() A.7,11,19 B.6,12,18C.6,13,17 D.7,12,17 4.对变量x,y有观测数据(x i,y i)(i=1,2,…,10),得散点图1;对变量u,v有观测数据(u i,v i)(i=1,2,…,10),得散点图2.由这两个散点图可以判断() A.变量x与y正相关,u与v正相关B.变量x与y正相关,u与v负相关 C.变量x与y负相关,u与v正相关D.变量x与y负相关,u与v负相关 5.已知一组数据x1,x2,x3,x4,x5的平均数是2,方差是1 3,那么另一组数3x1-2,3x2-2,3x3 -2,3x4-2,3x5-2的平均数,方差分别是() A.2,1 3B.2,1C.4, 2 3D.4,3 6.某学院有4个饲养房,分别养有18,54,24,48只白鼠供实验用.某项实验需抽取24只白鼠,你认为最合适的抽样方法是() A.在每个饲养房各抽取6只 B.把所有白鼠都加上编有不同号码的颈圈,用随机抽样法确定24只 C.从4个饲养房分别抽取3,9,4,8只 D.先确定这4个饲养房应分别抽取3,9,4,8只,再由各饲养房自己加号码颈圈,用简单随机抽样的方法确定 7.下列有关线性回归的说法,不正确的是() A.相关关系的两个变量不一定是因果关系 B.散点图能直观地反映数据的相关程度 C.回归直线最能代表线性相关的两个变量之间的关系 D.任一组数据都有回归直线方程 8.已知施肥量与水稻产量之间的回归直线方程为y^=4.75x+257,则施肥量x=30时,对产量y的估计值为() A.398.5 B.399.5C.400 D.400.5

相关文档
相关文档 最新文档