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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单项选择题
In ______, the only element that can be deleted or removed is the one that was inserted most recently.
A．a line
B．a queue
C．an array
D．a stack
单项选择题
C++ fully supports ______ programming.
A．visual
B．object-oriented
C．logic
D．natural language
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