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【題目】Scientists found that people need to stay outside for ______ two hours to have good eyesight.

A.at leastB.at onceC.at last

【答案】A

【解析】

句意:科學家發(fā)現(xiàn),人們需要在戶外待上至少兩個小時才能擁有良好的視力。

本題考查介詞短語。at least至少,at once馬上,at last最后。根據to have good eyesight可知,為了能擁有良好的視力,應在外面待的時間長一些,因此至少兩小時,故選A

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