单项选择题

（）is the sending and receiving of the messages by computer. It is a fast, low-cost way of communicating worldwide.

A．LAN
B．Post office
C．E-Mail
D．Interface

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单项选择题
（）is not a linear structure.

A．Graph
B．Queue
C．Stack
D．1-dimension array
单项选择题
（）is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.

A．Interface
B．Operating system
C．Internet
D．Application software
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