政府以特许使用权或提供直接服务为基础而取得收入的形式是( )。

A．税收

B．国有资产收益

C．政府收费

D．专项收入

In order not to disturb his research,his wife__________the news of her sickness.  [ ]

A. turned back                  

B. turned out    

C. held back                      

D, held out