听力原文:W: What did you think of the lecture? M: I thought it was very interesting. W: Did you really? M: Yes, didn't you? W: Certainly not. I thought he talked a lot of rubbish. M: So you think you know more than he does. W: Well, take coal for instance. W: What about it? M: Coal won't become important again. W: Why not? M: It's too dirty. They won't be able to find people to work down in coal mines in the future. W: They'll invent new kinds of machinery. M: Nonsense. The only sort of power they'll use in the future is atomic power. (12)