Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up (1) at the customer premise over slow (2) ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet (3) technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the (4) or cable "modem" over a much faster medium such as Ethernet. It also means that multiple (5) can connect to the Internet through the same connection.

（1）处应填入（）

A．buffer

B．modem

C．computer

D．server

民族团结、民族融合是中国历史发展的主流。唐朝增进汉藏之间友好关系的史实是[ ]

A．文成公主嫁入吐蕃 

B．赐予达赖五世

C．设置驻藏大臣                

D．妥善安置回归的土尔扈特部