I think walking is our health. A. good atB. bad atC. well inD. good for

问题补充：

I think walking is our health.

A. good at

B. bad at

C. well in

D. good for

答案：

A. good at

B. bad at

C. well in

(答案→)D. good for

解析：根据be good for ，表示对···不好，故选答案为D