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【题目】The world's population is increasing_________80 million every year.

A.asB.byC.inD.if

【答案】B

【解析】

句意:世界人口每年以8000万的速度增长。

考查介词辨析。as作为;by+数量词,表升降、增减的程度; in……里面;if如果(引导条件状语从句);从文字的表层意思推断空格处指“以8000万的速度增长,故选B

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