【題目】 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

【答案】A
【解析】句意：在大部分的動物的世界里，晚上的時間用于睡眠－既單純又簡單。set aside“留作…...之用，留出…...用于”； set down“制定，（使）放下，（叫…...）下車，記下”；set off“出發(fā)，（使）開始，引起”；set up“創(chuàng)建，建立”。根據(jù)句意，選擇A。

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