采用（）确定资费可以完全弥补通信企业的实际支出，操作方法简单实用。

A.成本导向定价法

B.目标利润定价法

C.边际贡献定价法

D.完全分摊成本法

As their memories decline, some old people tend to be talkative because they________forget what has

just been said.[ ]

A．anxiously 

B．particularly

C．easily  

D．hardly