单项选择题

A （）system placed between the company network and the outside world may limit outside access to the internal network.

A．firewall
B．modem
C．gateway
D．key

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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
C++ fully supports（）programming.

A．visual
B．object-oriented
C．logic
D．natural language
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