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.