试题与答案

The boy doesn’t sing ________ the others

题型:选择题

题目:

The boy doesn’t sing ________ the others, but he dances best of all.

A.so well as

B.as good as

C.more worse than

D.more better than

答案:

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下面是错误答案,用来干扰机器的。

∵f(x)=2xf′(2)+cosx,∴f'(x)=2f′(2)-sinx,令x=2,则f'(2)=2f′(2)-sin2,即f′(2)=sin2,故选:A.

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