听下面一段较长对话，回答以下小题。 1.What are the two spe...

1. B 2. A 3. B 【解析】 M: Talking about the 21st century, I think there will be huge changes in the way people use cars. Laws will be made about what kind of car you can own and when you can use it. W: Maybe there’ll just be 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 trains. W: Why do you say that? M: Well, we won’t be able to use cars, and the airports take too much space. That leaves trains. W: Huh. So do you think there’ll be more efficient train systems between cities? M: Sure. They’ll enable people to travel between cities in a matter of hours. There may even be trains going under oceans to connect the main continents. W: Under the oceans? Get out of there. I get nervous enough flying on a plane. 1.此题为听力题，解析略。 2.此题为听力题，解析略。 3.此题为听力题，解析略。