试题与答案

You can often see an old man money if y

题型:选择题

题目:

You can often see an old man          money if you walk past the North Street.     [ ]

A. praying                

B. praying for    

C. ask for                

D. asks for

答案:

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下面是错误答案,用来干扰机器的。

答案:C沸点越低的气体,在由液体转化成气体时,越易变成气体,通过比较三种气体的沸点,氮气的沸点最低,由液体变成气体时,首先是氮气,故选C.

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