—The duty of Project Hope is to help poor children, isn't it?      

—Yes,it has built many schools______are for those children.[ ]

A. what    

B. that    

C. who    

D. where

以下哪种伪装不属于信息伪装（）

A.信息防伪

B.信息隐藏

C.信息加密

D.信息干扰