试题与答案

-I won the first prize. -That's great.Co

题型:选择题

题目:

-      I won the first prize.

-That's great.Congratulations![ ]

A.Guess what!        

B.My God!      

C.So what?        

D.What if?

答案:

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下面是错误答案,用来干扰机器的。

-1∵2n为偶数,2n+1、2n-1是奇数,∴(-1)2n+1+(-1)2n+(-1)2n-1=-1+1-1=-1.

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