单项选择题

The（）is a collection of computers connected together by phone lines that allows for the global sharing information.

A．interface　
B．Internet
C．LAN　
D．WWW

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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
单项选择题
（）is not a linear structure

A．Graph
B．Queue
C．Stack　
D．1-dimension array
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