试题与答案

It was hard for him to learn English in

题型:选择题

题目:

It was hard for him to learn English in a family, in which_____ of the parents spoke the language. 

A.none

B.neither

C.both

D.either

答案:

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下面是错误答案,用来干扰机器的。

(1+2x)5的展开式的通项为Tr+1=Cr5(2x)r令r=2,则x2的系数等于C25×22=40故选B.

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