问题 单项选择题

连续生产的电子管厂,产品质量检验是这样安排的,在一天中,每隔半小时抽取一次产品进行检验,这是()。

A.分层抽样

B.简单随机抽样

C.整群抽样

D.系统抽样

答案

参考答案:A

阅读理解

阅读理解。

     John liked to wear his hair very long. Some of  his friends thought it looked like a girl's hair, but they

never made jokes about it, because John was a big strong man and he didn't think jokes about his hair

funny.

     John always went to the barber's (理发店) twice a month to have his hair cut and washed, and one

day the barber said to him. "Now why  don't you let me cut most of this hair off and make your head tidy? Nobody will recognize (认出) you if I do that. I'm sure."

      John said nothing for a few seconds and then he said,"perhaps you are right, but I am sure that

nobody will recognize you, either, if you do that to my hair."

1. John kept long hair because _______.

A. the barber wouldn't like to cut it short

B. the hair grew fast

C. John liked it to be long

D. John was a girl

2. His friends never made jokes about the hair because _______.

A. the hair is funny

B. John was big and strong

C. John liked his hair very much

D. John didn't like jokes about his hair and they were afraid of him

3. A barber is a _______.

A. man who looks after the babies

B. man who makes clothes for people

C. person who cut men's hair

D. shop where one's hair can be washed and cut

4. The barber advised (建议) John _______.

A. to have his hair cut short

B. to cut off most of his hair

C. to be cut off his long hair

D. not to be recognized by his friends

5.John's answer was _______.

A. a joke    

B. right    

C. a great praise (称赞)  

D. threatening (威胁) to the barber

填空题