I think walking is good our health.A. at B. withC. forD. so

问题补充：

I think walking is good our health.

A. at

B. with

C. for

D. so

答案：

A. at

B. with

(答案→)C. for

D. so

解析：本题的含义是步行对我们的健康有益，be good for表示对……有益，故本题选C。