A person′s calorie requirements vary______ his life.A.across B.throu

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问题 A person′s calorie requirements vary______ his life.

选项 A.across
B.throughout
C.over
D.within

答案B

解析考查介词辨析。across“穿过，横穿”，throughout“贯穿，遍及”，over“在……的上方，越过”，within“在……之内，在……里面”。句意为“人一生中对卡路里的需求是不同的”。Throughoutone’s life意为“在某人一生中，终生”，符合题意，故答案为B。

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