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【题目】No one has yet succeeded in explaining the ________of how life began.

A.puzzleB.problemC.causeD.reason

【答案】A

【解析】

句意:现在还没有人成功地解释生命如何开始这一疑惑。

考查名词辨析。puzzle疑问;problem问题;cause事业;reason原因。根据“No one has yet succeeded in explaining”没有人能成功回答,可知,生命的起源目前来说还是一个疑问,故选A

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