听力原文：W: Hi, Steve! M: Hi, Jan. I'm planning to go to London by train. Do you want to come with me? W: But it'd be cheaper by bus. M: I've got a student travel card. You can get cheap train tickets with it. W: That sounds good. How much does it cost? M: A card for six months is sixteen pounds. W: So how do I get one? M: You need two photographs—one for the card and one for the form. W: There's a photo machine in the post office. It gives you four photos for three pounds. M: So does the one in the library. But I went to a photographer's studio. It was cheaper. W: I don't have to show my passport or my driving license, do I? M: No, Jan, you only need a letter from your college. W: OK, I'll ask my teacher for one. M: And then you take everything to the tourist office and ask the travel agent. W: Great, next time you go to London, I'll come too! (23)