Most experts agree that washing hands regularly is a way to prevent the spread of many dis

问题补充：

Most experts agree that washing hands regularly is a way to prevent the spread of many diseases.

A. powerful

B. illegal

C. painful

D. awful

答案：

(答案→)A. powerful

B. illegal

C. painful

D. awful

解析：A. powerful强大的；权力大的；（药）有效的，B. illegal非法的，C. painful痛苦的， D. awful糟糕的，可怕的，非常的，极大的，句意：大多数专家同意经常洗手是一个有效防止很多疾病的方式。根据句意选A。