I think walking is our health.A. good atB. bad atC. well in D. 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：本题考查be good at的使用。本题的含义为我认为步行对我们的健康有益。be good for 表示对….有好处！符合题意；而be bad at表示对……有害：do well in表示在……做得好；be good at表示擅长做……的含义，后三者与本题的含义不符，故本题选D。