Many things that were once considered useful and for example tobacco is now thought ha

问题补充：

Many things that were once considered useful and , for example, tobacco, is now thought harmful.

A. beneficial

B. suitable

C. fulfilling

D. accessible

答案：

(答案→)A. beneficial

B. suitable

C. fulfilling

D. accessible

解析：句意:曾经被认为是有用和有益的东西，比如烟草，现在被认为是有害的。Beneficial有益的；suitable适当的；fulfilling令人高兴的；accessible易接近的。根据句意故选A。