单项选择题

A．To frighten the enemy.
B．To do a kind of routine work.
C．To relax and have a rest.
D．To have sharp claws.
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单项选择题
A．It sends out signals for help.B．It sounds an alarm to warn the driver.C．It takes over the driving immediately.D．It stops the car automatically.
A．It sends out signals for help.
B．It sounds an alarm to warn the driver.
C．It takes over the driving immediately.
D．It stops the car automatically.
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