问题补充：
As we all know, a proper amount of exercise to good health.
A. controls
B. offers
C. provides
D. contributes
答案：
A. controls
B. offers
C. provides
(答案→)D. contributes
解析：考查动词搭配：句意：众所周知，适量运动有助于健康。A 控制+ sth.or sb. B提供 offer to do愿意做 或是offer sb sth，offer sth to sb，C提供 provide sb with sth，provide sth for sb， D contribute to 有助于，选D.
