单项选择题

A．She’’d like to have the windows open.
B．She likes to have the air conditioner on.
C．The air is heavily polluted.
D．The windows are already open.
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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
单项选择题
Despite their varied designs, navigation computers used in cars ____________.
A．are more or less the same price
B．provide directions in much the same way
C．work on more or less the same principles
D．receive instructions from the same satellites
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