is good your health.A. Walk toB. Walking toC. To walk withD. Walking for

问题补充：

is good your health.

A. Walk, to

B. Walking, to

C. To walk , with

D. Walking, for

答案：

A. Walk, to

B. Walking, to

C. To walk , with

(答案→)D. Walking, for

解析：不定式与动名词都可以在句中作主语，一般情况下,不定式与动名词作主语可以互换，但不定式常常指某次具体的、将要发生的行为;而动名词则表示一般的、抽象的行为。例如: To save money now is not easy. 现在攒钱不容易。 Saving money is a good habit. 攒钱是个好习惯。“散步有益于健康。”是一般的、抽象的行为。故选D。