单项选择题

（）are web sites that search the web for occurrences of a specified word or phrase.

A．Search engines
B．WWW
C．Internet　
D．Java

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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

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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