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