单项选择题

A．At a conference hall.
B．At an art gallery.
C．At an airport.
D．At a hotel.
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单项选择题
A．It sends out signals for help.B．It takes over the driving immediately.C．It stops the car automatically.D．It sounds an alarm to warn the driver
A．It sends out signals for help.
B．It takes over the driving immediately.
C．It stops the car automatically.
D．It sounds an alarm to warn the driver
单项选择题
A．Be ready to speed up.B．Be ready to slow down.C．Be ready to move to a slower lane.D．Be ready to move to a faster lane.
A．Be ready to speed up.
B．Be ready to slow down.
C．Be ready to move to a slower lane.
D．Be ready to move to a faster lane.
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