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

Files can be lost or destroyed accidentally. Keep（）copies of all data on removablestorage media.

A．backup
B．back
C．black
D．backdown

单项选择题

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

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

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