当用户程序执行访管指令时，中断装置将使中央处理器如何工作

A．维持在目态

B．从目态转换到管态

C．维持在管态

D．从管态转换到目态

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.

73（）

A．access

B．cache

C．cast

D．storage