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
网友回答
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