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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