用所给单词的适当形式填空

1. More and more young people are trying to do something  _________( serve) the old.

2. The doctor did what he could_________ (save) the  dying man.

3. The teacher asked Ben___________(answer)a difficult question in class.

4. Don't forget___________ (see) my parents when you are in  Shanghai.

中央银行提高法定存款准备金率的政策效果是( )。

A．增加了商业银行的超额准备金

B．减少了商业银行的超额准备金

C．增加了基础货币

D．减少了货币乘数

E．加大了货币乘数