PASSAGE ONE [br] What were the studies done by Ronald Breslow and Mindy Levine a

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问题 PASSAGE ONE [br] What were the studies done by Ronald Breslow and Mindy Levine about?

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答案 Why amino acids accept only left-handedness．

解析第3段末句提到题目中的两个人Ronald Breslow and Mindy Levine，而他们属于第2段提到的两组研究者，该段说很多人觉得理解了氨基酸为什么只接受左旋的原因就能阐明生命的起源，第3段接着提到，甲基化氨基酸是这两个研究者研究的着手点，由此可知他们的研究是关于氨基酸为什么只接受左旋这个问题的，答案可概括为Why amino acids accept only left-handedness。应当注意的是，题目问的是RonaldBreslow和Mindy Levine的研究内容(were about)，而不是研究目的(goal)，故不要误以为答案是Howliving creatures came into exist。

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