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问题 单项选择题

箱形基础采用机械开挖基坑时，应在基坑底面以上保留（）厚的土层采用人工挖除。

A.200～400mm

B.300～500mm

C.400～600mm

D.500～700mm

答案

参考答案：A

选择题

—Look! How long ______ like this?

—More than 20 days! It’s usual here that rain pours without stopping in May.

A．did it rain

B．is it raining

C．has it been raining

D．doesn’t rain
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选择题

In China, those who want to enter universities have to _______ the entrance exams in June.   [ ]

A. check through    

B. work through    

C. look through    

D. go through
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