As we know, ________ is good exercise and it is necessar Wap版

试题详情及答案解析: As we know, ________ is good exercise and it is necessary for health.
A. walk B. walks C. walking; 答案：C; 试题分析：句意:众所周知，散步是一种好的锻炼方式并且这对健康是必不可少的。句子中缺少主语，应使用动名词充当主语。故选C。
考点：考查非谓语动词。