《高考数学专项预测练习题及答案【通用4篇】》

练习就是用题进行多角度、多层次的训练，通过多方面的强化，恰当的重复来掌握知识和技巧。题，既包括书面文字，又包括口述和动手操作的实验等。下面是的小编为您带来的高考数学专项预测练习题及答案【通用4篇】，希望能够给予您一些参考与帮助。

高考数学简单随机抽样专项练习题二、填空题 篇1

7、抽签法中确保样本具有代表性的关键是________.

[答案]　搅拌均匀

[解析]　在数理统计里，为了使样本具有较好的代表性，设计抽样方法时，最重要的是将总体“搅拌均匀”，使每个个体有同样的机会被抽到，而抽签法是简单随机抽样，因此在给总体标号后，一定要搅拌均匀。

8、某总体容量为M，其中带有标记的有N个，现用简单随机抽样方法从中抽取一个容量为m的样本，则抽取的m个个体中带有标记的个数估计为________.

[答案]　N.

[解析]　设m个个体中带有标记的个数为n，根据简单随机抽样的特点知=，解得n=N.。

高考数学简单随机抽样专项练习题一、选择题 篇2

1、关于简单随机抽样的特点，有以下几种说法，其中不正确的是（）

A.要求总体的个数有限

B.从总体中逐个抽取

C.它一般情况是一种不放回的抽取

D.每个个体被抽到的可能性与抽取的顺序有关

[答案]　D

[解析]　在简单随机抽样中，每个个体被抽到的可能性相等，它与抽取的顺序无关，故D错误。

2、下列抽样中，用抽签法方便的有（）

A.从某厂生产的3 000件产品中抽取600件进行质量检验

B.从某厂生产的两箱***每箱15件***产品中抽取6件进行质量检验

C.从甲、乙两厂生产的两箱***每箱15件***产品中抽取6件进行质量检验

D.从某厂生产的3 000件产品中抽取10件进行质量检验

[答案]　B

[解析]　当样本个数比较小且制号签比较方便时，用抽签法。故选B.

3、下列说法正确的是（）

A.抽签法中可一次抽取两个个体

B.随机数法中每次只取一个个体

C.简单随机抽样是有放回抽样

D.抽签法号签放入箱子中，可以不搅拌直接抽取

[答案]　B

[解析]　根据简单随机抽样的特点判断。

4、下列抽样方法是简单随机抽样的是（）

A.从50个零件中一次性抽取5个做质量检验

B.从50个零件中有放回地抽取5个做质量检验

C.从实数集中随机的抽取10个正整数分析奇偶性

D.运动员从8个跑道中随机抽取一个跑道

[答案]　D

[解析]　简单随机抽样每个样本是逐个抽取，并且是无放回的抽取，样本总体的容量为有限个，故A、B、C均错。

5、用随机数法从100名学生***男生25人***中抽选20人进行评教，某男学生被抽到的概率是（）

A.0.01 B.0.04

C.0.2 D.0.25

[答案]　C

[解析]　明确是简单随机抽样且每个个体被抽到的概率是相等的，问题的突破口就找到了。因为样本容量为20，总体容量为100，所以总体中每一个个体被抽到的概率为=0.2.

6、下列问题中，最适合用简单随机抽样方法抽样的是（）

A.某单位有员工40人，其中男员工30人，女员工10人，要从中抽8人调查吸烟情况

B.从20台电视机中抽取5台进行质量检查

C.中央电视台要对春节联欢晚会的收视率进行调查，从全国观众中选10000名观众

D.某公司在甲、乙、丙三地分别有120个、80个、150个销售点，要从中抽取35个调查收入情况

[答案]　B

[解析]　根据简单随机抽样的概念及其特点可知当总体中的'个体数和样本容量都较小时可采用简单随机抽样。抽出的样本必须准确地反映总体特征。

英语四级考试听力模拟预测题 篇3

Part Ⅰ Writing

注意：此部分试题在答题卡1上。

Part Ⅱ Reading Comprehension

Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1.

For questions 1-7, mark

Y if the statement agrees with the information given in the passage;

N if the statement contradicts the information given in the passage;

NG if the information is not given in the passage.

For questions 8-10, complete the sentences with the information given in the passage.

Landfills

You have just finished your meal at a fast food restaurant and you throw your uneaten food, food wrappers, drink cups, utensils and napkins into the trash can. You dont think about that waste again. On trash pickup day in your neighborhood, you push your can out to the curb, and workers dump the contents into a big truck and haul it away. You dont have to think about that waste again, either. But maybe you have wondered, as you watch the trash truck pull away, just where that garbage ends up.

Americans generate trash at an Astonishing rate of four pounds per day per person; which translates to 600,000 tons per day or 210 million tons per year! This is almost twice as much trash per person as most other major countries. What happens to this trash? Some gets recycled or recovered and some is burned, but the majority is buried in landfills.

英语四级考试听力模拟预测题 篇4

1.M:How quickly technology changes.So many people have a computer in their home nowadays.

W:I know.I feel so behind the time.

Q:What does the woman mean?

2.W:This spring weather is perfect for playing tennis.

M:Unfortunately they only time I get to enjoy it is when I'm walking to class or to the library.

Q:What does the man imply?

3.M:When are you ever going to finish this report?

You've been working on it for three months.

W:Only two and half.But it does seem longer.

Q:What does the woman say about the report?

4.W:I hear you have a brother who went to school here too.Have I ever seen him?

M:Well,he graduated last year.But you would never have guessed that we were brothers.

Q:What does the man imply?

5.W:Nobody told me that Bill was in the hospital.

M:Sorry.I meant to give you a call when I found out,but it slipped my mind.

Q:Why did the man apologize to the woman?

6.M:I don't know if I will be able to hand in my economics paper on time.

W:Haven't you heard that the professor gave us another week?

Q:Where did his conversation most probably take place?

7.M:I get the feeling that Sally never really listens to me.

W:You said it.It's as if she were always using the time to think what she will say next.

Q:What do we know about Sally?

8.M:Hello,This is Mark Smith.I'm calling to see if my blood test results are in.

W:Dr.Miller just sent them to the lab last night,so the earliest they could be back is tomorrow.

Q:What does the woman mean?

9.M:I bought this fish to cook for my dinner tonight,but it doesn't look all that fresh to me now.

Would you say it's still all right to eat?

W:Let's take a look.Oh,if I were you,I wouldn't even think of it.

Q:What do we know about the fish?

10.M:My roommate and I have decided to do our own cooking next semester.

W:Then I hope you'll have a lighter schedule than this term.

Q:What problem does the woman think the man may have?

Passage One

How men first learnt to invent words is unknown;in other words,the origin of language is a mystery.All we really know is that men,unlike animals,somehow invented certain sounds to express thoughts and feelings,actions and things,so that they could communicate with each other;and that later they agreed upon certain signs,called letters,which could be combined to represent those sounds,and which could be written down.Those sounds,whether spoken,or written in letters we call words.The power of words,then,lies in their associations the things they bring up before our minds.Words become filled with meaning for us by experience,and the longer we live,the more certain words recall to us the glad and sad events of our writers are those who not only have great thoughts but express these thoughts in words which appeal powerfully to our minds and emotions.This charming and telling use of words is what we call literary style.Above all,the real poet is a master of words.He can convey his meaning in words which sing like music,and which by their position and association can move men to tears.We should therefore learn to choose our words carefully and use them accurately,or they will make our speech silly and ridiculous.

Questions 11 to 13 are based on the passage you have just heard.

11.What do we know about the origin of language?

12.Where does the real power of words lie?

13.Which of the following statements about the real poet is not true?

Passage Two

Too often young people get themselves employment quite by accident,not knowing what lies in the way of opportunity for promotion,happiness and security.As a result,they are employed doing jobs that afford them little or no satisfaction.Our school graduates face so much competition that they seldom care what they do so long as they can earn a living.Some stay long at a job and learn to like it,others move from one job to another looking for something to suit them.The young graduates who leave the university look forjobs that offer a salary up to their expectations.Very few go out into the world knowing exactly what they want and realizing their own all search about in the darkness and their chief concern when they look for a job is to ask what the salary is like.They never bother to think whether they are suited for the job or,even more important,whether the job suits them.Having a job is more than merely providing yourself and your dependents with daily bread and some money for leisure and entertainment.It sets a pattern of life and,in many ways,determines social status in life,selection of friends,leisure and interests.In choosing a career you should first consider the type of work which will suit your is more sad than taking on a job in which you have no interest,for it will not only discourage your desire to succeed in life but also waste your talents and ultimately make you an emotionally bitter person.

Questions 14 to 16 are based on the passage you have just heard.

14.Which of the following is the best title for this passage?

15.What are graduates mainly concerned about when looking for a job?

16.Which of the following statements is true according to the passage?

Passage Three

Bill Grant was a famous newspaper editor in the United States.He worked for the same newspaper from 1926 to 1968.。He started as a clerk in 1948.

Later he became the editor.That was the position he held until he retired.Bill wrote his first story for the paper the day the New York Stock Market crashed in 1929.When the first news of the stock market crash came into the office,Bill immediately sat down and wrote up the story.The editor liked it so much that he used the story.And he didn't make any changes into it.After that the editor decided Bill should be a writer.He felt that Bill was not using his ability working as a clerk.After the first story Bill became especially interested in financial news.But he wrote stories on just about everything.In 1945 he spent 5 months in Europe.His editor had decided he should write about the end of World War of Bill's greatest moments came in 1946.A story he had written on war won the National Newspaper's Award.Bill took the prize but he gave all the credit to his editor.It was just before Christmas in 1976 that he learned that he had cancer.Six months later he was dead.But he never stopped his work as an editor.The day before he died he had spent a full day at the office.

Questions 17 to 20 are based on the passage you have just heard.]17.When did Bill begin working for the paper?

18.Why was he made a writer for the paper?

19.Which of the following statements is not true about Bill?

20.How did Bill die?