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

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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
单项选择题
Insufficient （） can cause a processor to work at 50% or even more below its performance potential.

A．mouse
B．I/O
C．document
D．memory
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