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.