听力原文:W: Can I help you? M: Oh, I'm just looking, thanks. Well, actually, I'm looking for something for my girlfriend. W: And what sort of thing are you looking for? M: I don't really know. A dress? W: Right. What color does your girlfriend usually wear? M: Oh, dear… W: OK, what color are her eyes? M: Green. W: Right, purple suits people with green eyes. Now, what size is she? M: Um, well, sort of, she isn't very big, but she's not particularly small. That'll be medium then. W: Well, we have this rather nice silk evening dress here… M: Good, I'll take it. Thank you. How much is it? W: That's 70 pounds, sir. How would you like to pay? M: Seventy? By credit card, please. W: Fine. If you could just sign… M: Here you are. Goodbye. Where probably are the speakers?