Considering his health, I advise him to an hour or two each day to work out.
A. set aside
B. set off
C. set up
D. set about
网友回答
(答案→)A. set aside
B. set off
C. set up
D. set about
解析：短语辨析。A放在一边，不管，不顾；B引爆，使…发生；C建立，设立；D出发；句意：考虑到他的年龄，我建议他明天把1到2个小时的时间放在一边在锻炼。故A正确。