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
A typical peripheral device has______which the processor uses to select the device's internal registers.
A．data
B．a control
C．a signal
D．an address
单项选择题
______is the sending and receiving of the messages by computer.It is a fast．low-cost way of communicating worldwide.
A．LAN
B．Post office
C．E-Mail
D．Interface
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