People usuallysome money for old age.A. pick upB. set asideC. put offD. give away

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A. pick up
(答案→)B. set aside
C. put off
D. give away
解析：题意是人们为防老而留出一部分钱。pick up拾起；set aside留出，拨出(钱财、时间等)，把……置于一旁；put off推迟，劝阻，使某人下车；give away失去(机会)。