Effective measures should be taken to the rare species being over-killed by human beings

问题补充：

Effective measures should be taken to the rare species being over-killed by human beings.

A. keep; against

B. prevent; from

C. stop; against

D. protect; from

答案：

A. keep; against

B. prevent; from

C. stop; against

D. protect; from

解析：句意：一些有效的措施应该被采取来保护稀有物种防止被人类的过度捕杀。protect sb from doing sth保护某人免遭…，故选B