As a heavy smoker he finds it hard to get rid of the habit which has a bad on his healt

问题补充：

As a heavy smoker , he finds it hard to get rid of the habit, which has a bad on his health.

A. affect

B. effect

C. effort

D. affection

答案：

A. affect

(答案→)B. effect

C. effort

D. affection

解析：A .affect动词：影响，感染，B. effect名词：影响，效果，C. effort名词：努力，D.affection名词：喜爱，句意：做为烟瘾很重的人，他发现很难戒掉这个习惯，这对他的健康有不好的影响。选B。