A、One. B、Two. C、Three. D、Four. B本题也可以直接从对话中找到答案。对话中关于照片时有一句话“You need two photographs—one for the card and one for the form．”所以B

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, H1 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!