The study shows that the scenes in movies and TV are harmful children.A. cheerful; forB.

问题补充：

The study shows that the scenes in movies and TV are harmful children.

A. cheerful; for

B. violent; to

C. disappointing; for

D. touching; for

答案：

A. cheerful; for

(答案→)B. violent; to

C. disappointing; for

D. touching; for

解析：句意：研究表明在电影和电视上暴力的场面对孩子们有害。violent 凶猛的，暴力的，be harmful to对什么有害。所以选B。