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问题 选择题
When the teacher comes, the students stop ________ at once.

A. talk
B. to talk
C. from talking
D. talking
答案

答案：D

单项选择题

“It is declared that this shipment does not contain any wood packing materials.”与这句话意思接近的是( )。

A．We declare that no wood packing material was used in this shipment.
B．No declaration was made whether wood packing materials had been used or not.
C．If you don't make any declaration, we will not use any wood packing material.
D．We will not use any wood packing material since you have provided us a declaration of no-wood packing material.
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单项选择题

最基本的方法是：_________

A．单纯随机抽样
B．系统抽样
C．整群抽样
D．分层抽样
E．分层随机抽样
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