.To improve your health, you can 25— 30 minutes three or four times a week to do simple things such as walking ,cycling or running .
A. give off
B. turn down
C. take over
D. set aside
网友回答
A. give off
B. turn down
C. take over
(答案→)D. set aside
解析： 考查短语辨析。give off释放光线或气味，turn down 调低，拒绝，take over 接管，set aside 留出，抽出，句意：为了提高你的健康，你可以每周抽出三或四次25到30分钟的时间做一些简单的事情，如散步，骑自行车或跑步。故选D。