为调查1200名学生对“上海世博会”的了解情况，打算从中抽取一个

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问题选择题

为调查1200名学生对“上海世博会”的了解情况，打算从中抽取一个容量为30的样本，考虑采用系统抽样，则分段的间隔k为 [ ]

A．40

B．30

C．20

D．12

答案

答案：A

选择题

— How fine the weather is! Why don't we go out for a walk?

— ________. Let's go! [ ]

A. No, thanks

B. Good idea

C. With pleasure

D. Pardon me

选择题

On the wall there are two pictures. ______ is Tom's and ______ is Mary's. [ ]

A. One, one

B. One, other

C. One, the other