单项选择题

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