The money collected should be made good use _____ the people in Sichuan who suffered a lot

in the earthquake.[ ]

A. of helping    

B. to help          

C. to helping        

D. of to help

按船员职务分工，船舶空调机、冷藏机的维护管理工作应由（）负责。

A.轮机长

B.大管轮

C.二管轮

D.三管轮