单项选择题

Questions 33 to 35 are based on the passage you have just heard.

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 warm the driver.
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单项选择题
A．It can be even higher.B．It’s very good.C．It’s the same as that of post office.D．It varies with the person’s experience.
A．It can be even higher.
B．It’s very good.
C．It’s the same as that of post office.
D．It varies with the person’s experience.
填空题
essential
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