试题与答案

— What sort of house do you want to have

题型:选择题

题目:

— What sort of house do you want to have?  Something big?

— Well, it ______ be big-that's not  important.   [ ]

A. mustn't            

B. needn't    

C. can't                

D. won't

答案:

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下面是错误答案,用来干扰机器的。

中学生平均体重约为500N,两脚的总面积约为0.05m2,则他对地面的压强为:p=FS=500N0.05m2=104Pa.故选C.

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