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问题 选择题

26．Even if there is no scientific proof yet ______ secondhand smoke causes cancer, there is no reason why nonsmokers should be forced to take this risk．

A．which

B．that

C．when

D．Where

答案

答案：B

单项选择题

对重大缺陷一般应在（）内予以处理，不得拖压酿成事故。如因备品或停电等原因，需要在一周内处理的重大缺陷须经领导同意。

A.一日

B.二日

C.三日

D.五日
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选择题

You must be aware that it’s here _____we found evidence of some of the earliest people who lived in this part of the world.

A．where

B．that

C．/

D．what
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