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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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

单项选择题

WWW服务器与客户机之间采用（）协议进行网页的发送和接收。

A．HTTP
B．URL
C．SMTP
D．HTML

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