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
We can learn from the passage that navigation computers ______.
A．will greatly promote sales of automobiles
B．may help solve potential traffic problems
C．are likely to be accepted by more drivers
D．will soon be viewed as a symbol of luxury
单项选择题
The navigation computer functions ______.
A．by means of a direction finder and a speed detector
B．basically on satellite signals and a map database
C．mainly through the reception of turn-by-turn directions
D．by using a screen to display satellite signals
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