Questions 11 to 18 are based on the conversation you have just heard.

A．There is a sign of "green hand" inside the car.
B．There are two sets of brakes inside the car.
C．It is only big enough to hold 3 persons.
D．It can’t run very fast no matter how you drive.

A．Because it gives people a sense of achievement.
B．Because most people like doing it every day.
C．Because it is neither biochemical nor poisonous.
D．Because it increases the heart rate and circulation.