单项选择题

The （） is designed specifically as a security system for preventing unauthorized communications between one computer network and another computer network.

A．firewall
B．protocol
C．hacker
D．virus

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单项选择题
The term, （）loop, refers to a loop that is contained within another loop.

A．program
B．nested
C．statement
D．network
单项选择题
A（）is a named momory block . By using its name, we can refer to the data stored in the memory block.

A．word
B．record
C．program
D．variable
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