单项选择题

The usual address for a Web site is the ______ page address， although you can enter the address of any page and have that page sent to you.

A．home
B．main
C．host
D．house
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单项选择题
Most ______ measures involve data encryption and password.
A．security
B．hardware
C．display
D．program
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
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