问题 单项选择题

有五个不同职业人群的冠心病患病率资料,若比较不同职业人群的冠心病患病率是否相同

统计学检验的无效假设应是

A.H0:P1=P2=P3=P4=P5

B.H0:P1=P2=P3=P4>P5

C.H0:π1=π2=π3=π4=π5

D.H0:π1≠π2≠π3≠π4≠π5

E.H0:π1=π2=π3=π4=π5

答案

参考答案:C

阅读理解

阅读理解。

     It was a Sunday morning. Peter, a seven-year-old boy, watched TV in the room while his brother Bill did

his homework. Their father watered the flowers in the garden and their mother went out to do some shopping.

At ten the woman came back with a heavy basket. Peter ran up to her. He wanted to know what his mother

bought. He found a bag of oranges in it. He liked them very much and wanted to eat. His mother stopped him.

She gave five to each son and went to the kitchen (厨房). Peter ate his oranges soon but his brother was busy(忙) finishing his homework and didn't touch his. Suddenly (突然) the telephone rang and Bill ran to answer it.

Bill's friend asked him to play football with them. And when Bill talked with his friend, Peter took two of his

oranges away and ate them. Bill found it and called him out and beat (打) him behind the house. He didn't tell

his parents about it.

     The next morning Miss Ball taught her class subtraction (减法). Peter didn't hear what she said and couldn't

understand it. So he couldn't answer her questions. She began to give him an example, "If your brother has

five nuts and you take two from him, what will the result (结果) be?" "He'll beat me, madam," answered the

boy. All his classmates began to laugh.

1. How many people are there in Peter's family?

A. Two.

B. Three.

C. Four.

D. Five.

2. How many oranges did Peter eat?

A. Five.

B. Six.

C. Seven.

D. Ten.

3. Miss Ball was Peter's ________ teacher.

A. Chinese

B. maths

C. English

D. Physics

4. Why didn't Peter tell his parents that his brother beat him?

A. Because he knew he was wrong.

B. Because he was afraid of his brother.

C. Because his father didn't like him.

D. Because his mother let Bill to do so.

5. Peter couldn't answer the teacher's question because________.

A. he was stupid (蠢笨)

B. he didn't listen to the teacher carefully

C. he was weak (差) in maths

D. he pretended(假装) to be a fool (傻瓜)

填空题