Some of the government officials are not doing their jobs well since some of the questions from the ordinary people never get         .

A．to answer

B．answering

C．answered

D．to be answered

点—点式网络与广播式网络在技术上有重要区别。点—点式网络需要采用分组存储转 发与______。

A．路由选择

B．交换

C．层次结构

D．地址分配