It’s generous _______ him to give so much money to charities. Now he thinks it's important _______him to help people in poor areas. 

A．for , to

B．of , for

C．to , of

D．for, for

起落架减震支柱内油针的作用是（）

A.将减震支柱锁在“收上”位

B.将减震支柱锁在“放下”位

C.减震支柱压缩时延迟油液的流动

D.调节减震支柱内的空气量