单项选择题

Most ______ measures involve data encryption and password.

A．security
B．hardware
C．display
D．program
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单项选择题
The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing system for protecting the secret information.
A．web pages
B．modem
C．security
D．network
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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