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In much of the animal world, night is the time        for sleep—pure and simple.

A. set aside    B. set down    C. set off     D. set up建立;準備; 安排;引起

 

A。本題考查短語和句意的理解。set aside把…放置一旁;不理會;留出;set down 制定;(使)放下;(叫…)下車;記下set off  出發;(使)開始;引起;點燃set up建立;準備; 安排;引起

【句意】在大部分的動物世界里,晚上的時間純粹是用于睡眠的。

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