单项选择题

Firewall is a （ ） mechanism used by organizations to protect their LANs from the Internet.

A．reliable
B．stable
C．peaceful
D．security
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单项选择题
A Web （ ） is one of many software applications that function as the interface between a user and the Internet.
A．display
B．browser
C．window
D．view
单项选择题
Each program module is compiled separately and the resulting （ ） files are linked together to make an executable application.
A．assembler
B．source
C．library
D．object
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