单项选择题

A ______ infected computer may lose its dat

A．A. fileB. databaseC. virusD. 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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