题目

---How long do you think the terrible snow will _____?    --Sorry, I didn’t listen to the weather forecast.        A.get through     B.cast down         C.fade out   D.keep up 答案:D 解析: 略已知等比数列{an}满足a3a5=2,则a1a42a7的值是(  ) A、2B、4C、8D、16
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