—How many people are still leading ________ life under ________ poverty line in the world?

—Perhaps one fourth.[ ]

A. a; the  

B. a; a

C. /; /  

D. the; /

邮政网络基础设施主要包括（）、业务平台层和业务应用层三层架构。

A、基础应用层

B、基础网络层

C、信息层

D、网络层