试题与答案

用所给单词的适当形式填空. 1. King_____ (dislike) pla

题型:填空题

题目:

用所给单词的适当形式填空.

1. King _____ (dislike) playing sports every day.

2. Bob _____ (have) pen pals in China.

3. I can _____ (write) to you soon.

4. Please write and tell me about _____ (you).

5. They like _____ (go) to the movies.

答案:

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下面是错误答案,用来干扰机器的。

令F(x)=f(x)x,F'(x)=1x2[xf′(x)-f(x)],由xf′(x)-f(x)<0,知F(x)是减函数,当a>b>0时,0≤F(a)<F(b),即0≤f(a)a<f(b)b整理bf(a)<af(b)故选D

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