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That boy ________ be Tom. He has gone to his hometown to visit his grandparents.
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I turned to bookshops and libraries looking for information and found _______.
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“天宫一号”升空这一天上海天气晴好,黄昏时可看到的月相是 [ ]
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蜜蜂和蝴蝶同时从你脑后经过,为什么能感觉到蜜蜂的存在而感觉不到蝴蝶的存在?
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设{an}是公差不为0的等差数列额,a1=2,且a1,a3,a6成等比数列,则{an}的前n项和Sn=( )
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