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
The line of computing jobs waiting to be run on a computer system might be a （）. The jobs are serviced in the order of their arrival，that is，the first in is the first out.

A．queue
B．stack
C．array
D．record
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