单项选择题

A ______ infected computer may lose its data.

A. file
B. database
C. virus
D. program
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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
单项选择题
The basic unit of measure in a computer system is the ______. It is the smallest unit in computing. There are some other measures in a computer, such as Kilobyte, Megabyte, Gigabyte and so on.
A. KiloByte
B. bit

C. GigaByte
D. MegaByte
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