Considering his health I advise him to an hour or two each day to work outA. set aboutB

问题补充：

Considering his health, I advise him to an hour or two each day to work out．

A. set about

B. set off

C. set up

D. set aside

答案：

A. set about

B. set off

C. set up

(答案→)D. set aside

解析：考查短语辨析。set about 着手做某事，set off 动身，出发，set up 建立，set aside 留出，抽出，句意：考虑到他的健康，我建议他每天抽出一到两小时锻炼身体。故选D。