单选题 According to the man, why do people have to pass laws on car use?
A. There are too many different kinds of cars on the road.
B. They have to control the number of traffic on the roads.
C. Cars may not be a necessary means of transportation.
D. Some cars may be too fast and too dangerous for people.

【正确答案】 B

【答案解析】[解析] 11-13
M: Talking about the 21st Century, as far as transportation is concerned, I think there're going to be huge changes in the way people use cars.They'll probably have made laws about what kind of car you can own and when you can use it.
W: And I bet it'll be impossible for people to use cars whenever they like. There'll be just too many of them on the roads.The air will be so seriously polluted that nobody will be able to breathe normally.
M: Exactly. People will have to rely on other modes of transportation — especially trains.
W: Why do you say that?
M: Well, we won't be able to use caps, and airports take too much space.With the supply of land for airports shrinking around the world, there are going to be fewer airports and fewer plane flights.That leaves trains.
W: Huh. So do you thinkthere will be more efficient train systems between cities?
M: Sure.Trains are relatively safer and cleaner, and they can enable people to take inter-city travel in a matter of hours.There may even be trains going under the oceans to connect the major continents.
W: Under the oceans? Get out of here! I get nervous enough flying on a plane.

单选题 Why does the man think there will be fewer plane flights?
A. The land for airports will be used for other purposes.
B. There are too many people travelling by car.
C. Many people have a fear for air travel.
D. There will be faster way" of travelling than travelling by air.