Only through _______ talks can we build trust and only through cooperation can we create ________ win-win economic situation．

A．\ ; a

B．the ; the

C．\ ; the

D．the ; a

缺省路由是一种特殊的路由，可以通过静态路由配置，某些动态路由协议也可以生成缺省路由，如OSPF和IS-IS。