Parents have a duty to their children from the harmful effects of the Internet. A. hideB.

问题补充：

Parents have a duty to their children from the harmful effects of the Internet.

A. hide

B. prevent

C. stop

D. protect

答案：

A. hide

B. prevent

C. stop

(答案→)D. protect

解析：考查动词辨析。prevent/stop sb. from doing sth.阻止某人做某事 protect sb. from doing sth. 保护某人免受…没有hide sb. from sth 的短语，只有hide sth from sb把某事瞒着某人根据意思，应选D。