单项选择题

（） infected computer may lose its data.

A. file
B. data base
C. virus
D. program

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单项选择题

We can use the word processor to （） your documents.

A．edit
B．compute
C．translate
D．unload

单项选择题

As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （）.

A．fragmentation
B．compaction
C．swapping
D．paging

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