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

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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
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