Li Hua has __________ good knowledge of the English language and this will be an advantage over others in finding __________ proper job.

A．a, the

B．a, a

C．/, a

D．/, the

以下不属于防火墙技术的是（）。

A、IP过滤

B、线路过滤

C、应用层代理

D、计算机病毒检测