（）简单、便宜并且能快速实施。

A．静态包过滤防火墙 

B．动态包过滤防火墙 

C．应用网关防火墙 

D．状态检测网关防火墙

Woman: I'm going to ask the neighbors to turn the music down. I can't hear myself think.Man: Do you really think it makes any difference to themQuestion: What does the man imply

A．She should move to another place.

B．The neighbors probably won't turn down the music.

C．He wants to listen to different music.

D．He doesn't think the music is particularly loud.