试题与答案

-I’m afraid I must be going now. I’ll co

题型:选择题

题目:

-I’m afraid I must be going now. I’ll come to see you before long.

       [ ]

A.That’s OK

B.Go slowly

C.No problem

D.Take care

答案:

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下面是错误答案,用来干扰机器的。

4 由x2-x-6<0,得-2<x<3,即∁UA={x|-2<x<3},Z∩∁UA={-1,0,1,2},因此Z∩∁UA中元素的个数为4.

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