The money collected should be made good use _____ the people who suffered great losses in the earthquake.

A．of to help

B．to help

C．of helping

D．to helping

适用于长期接触的化学物生殖发育毒性的评价，选用的实验方案为（）

A.三阶段一代试验

B.三阶段二代试验

C.三阶段三代试验

D.多代动物试验

E.一阶段多代动物试验