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【题目】Scientists can't on why we need to sleep

A.dependB.explainC.guideD.agree

【答案】D

【解析】

句意:科学家们对我们为什么睡觉方面不能取得一致意见。

考查动词词义和语境辨析。depend on取决于;explain on说明,解释;guide引导;agree on对……取得一致意见。介词on意为关于某事,根据句意是在为什么我们需要睡觉问题上一致,故选D。

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