单项选择题

（）is a mechanism used for protecting the users outside of network from accessing some non-authorized computer resources.

A．Network Card
B．protocol
C．Firewall
D．Router

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单项选择题

A （） is a data type whose major attributes are determined by the roles governing the insertion and deletion of its elements.

A．stack
B．queues
C．pointer
D．record

单项选择题

For many years, the principle goal of computer （） was to write short pieces of code that would execute quickly.

A．users
B．programmers
C．that
D．program

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