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【题目】The atmosphere lets sunlight in and keeps warmth _______ getting out.

A.byB.inC.throughD.from

【答案】D

【解析】

句意:大气层让阳光进来,而不让热量散发出去。

考查介词辨析。by通过……方式;in……里面;through通过,穿过;from来自……。根据句意可知,这里考查句型keep sb./sth. from doing …“阻止某人/某物做某事。故选D

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