单项选择题

One of the basic rules of computer security is to change your （） regularly.

A．name
B．computer
C．device
D．password

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单项选择题
One of the greatest features of a home （）is the ability to share one Internet connection simultaneously over two or more computers.

A．computer
B．device
C．network
D．work
单项选择题
The （） in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.

A．illness
B．virus
C．weakness
D．attachment
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