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    【题目】It puzzles the scientists _____ some mammals produce their young _____ others lay eggs．

    A. that; while B. what; while

    C. that; as D. what; as

    【答案】A

    【解析】试题分析：本句中的it是形式主语 ，真正的主语是后面that引导的主语从句，that在主语从句中不充当任何成分，只起引导作用。第二空的连词while然而，表示上下文轻微的转折关系。As不能表示上下文的转折关系。句义：让一些科学家困惑的是一些哺乳动物生出下一代，而另外一些却产卵。故A正确。

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