使用常用文字编辑工具编辑正文时，为改变该文档的文件名，常选用（）命令；在"打印预览"方式下，单击"(2)"按钮可返回编辑文件；将正文中所有"Computer"改写为"计算机"，常选用 （）命令。

为改变该文档的文件名，常选用（）命令

单项选择题In （）programming, the user determines the sequence of instructions to be executed, not programmer.

A．top-down　
B．structure　
C．data-driven
D．event-driven

单项选择题Files can be lost or destroyed accidentally. Keep（）copies of all data on removable storage media.

A．backup
B．back　
C．black　
D．backdown

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

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