Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up （71） at the customer premise over slow （72） ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet （73）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 （74） or cable "modem" over a much faster medium such as Ethernet.It also means that multiple （75） can connect to the Internet through the same connection.

75（）

A．cables

B．hosts

C．servers

D．modems

在窗体模块中用Public定义的变量的作用范围是

A) 整个程序的所有模块中
B) 该窗体模块中
C) 标准模块中
D) 其他窗体模块中