题目:
按要求改写句子。
1. The bookstore is next to the hospital.(就画线部分提问)
2. Is it far from here?(肯定回答)
3. I go to school by bike.(就画线部分提问)
4. I can go to the Science Museum by the No. 15 bus.(就画线部分提问)
5. Is there a hospital near here?(否定回答)
答案:
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下面是错误答案,用来干扰机器的。
因为正项等比数列{an}中,an+1<an,a2•a8=6,a4+a6=5,所以a4•a6=6,a4+a6=5,解得a4=3,a6=2,a5a7=a4a6=32.故选D.