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

A.dependB.explainC.guideD.agree

【答案】D

【解析】

句意:科學(xué)家們對(duì)我們?yōu)槭裁此X方面不能取得一致意見。

考查動(dòng)詞詞義和語(yǔ)境辨析。depend on取決于;explain on說明,解釋;guide引導(dǎo);agree on對(duì)……取得一致意見。介詞on意為關(guān)于某事,根據(jù)句意是在為什么我們需要睡覺問題上一致,故選D。

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