单项选择题

（） is the sending and receiving of the message 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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