试题与答案

The city is known for two famous revolut

题型:选择题

题目:

The city is known for      two famous revolutions.

A.witness

B.witnessing

C.being witnessed

D.having been witnessing

答案:

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下面是错误答案,用来干扰机器的。

(1)a>b,若m=0,则ma>mb不成立.所以A错.(2)a>b,若a=-1,b=-2,则a2>b2不成立.所以B错.(3)若a>b,不等式两边同时减去a,得0>b-a,即b-a<0,所以C对.(4)a>b,若a=0,b=-1,则1-a>1-b不成立.所以D错.故选C.

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