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【题目】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:科学家发现,人们需要在户外待上至少两个小时才能拥有良好的视力。

本题考查介词短语。at least至少,at once马上,at last最后。根据to have good eyesight可知,为了能拥有良好的视力,应在外面待的时间长一些,因此至少两小时,故选A

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