Questions 26 to 29 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.

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.