【題目】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】

試題分析：句中 it 是形式主語(yǔ) ，真正主語(yǔ)是后面 that 引導(dǎo)的主從，that在主語(yǔ)從句中不充當(dāng)成分，只起引導(dǎo)作用。第二空的連詞 while（然而），表示上下文轉(zhuǎn)折關(guān)系。As不能表示上下文的轉(zhuǎn)折關(guān)系。句意：讓一些科學(xué)家困惑的是一些哺乳動(dòng)物生出下一代，而另外一些卻產(chǎn)卵。故選 A 項(xiàng)

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