Unemployment arises partly from overpopulation and if fines can’t keep the rich from having more than one child, we should say that the regulation is not ________.

A．efficient

B．evident

C．economic

D．effective

下列哪项不属于椿皮的功效（）

A.止血，止泻

B.固精缩尿

C.清热燥湿

D.收敛止带

E.杀虫