单项选择题

It is recommended in the passage as a security measure that people should ______.

A．turn off network services
B．employ a full-inspection firewall
C．make sure that servers and applications are combined
D．eliminate all the programs
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单项选择题
It is clear that Steve Wozniak, Bill Gates and Linus Torvalds are ______.
A．all good examples of today' s computer users
B．driving by greed, power, revenge, or some other malicious intent
C．to push programs beyond what they are designed to do
D．all dead
单项选择题
According to the passage, hacker is ______.
A．highly recognizable names behind many of the computer technologies used today
B．the negative connotation of those computer users
C．a game, employing the tools that are readily available via the Internet
D．people who break into computer systems
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