听力原文：W: Why, Peter! You are sweating heavily. Where have you been? M: I've just been to the Fitness Centre to learn Street dance. W: What is street dance? M: Street dance is a newly emerged way of keeping fit. It was introduced into China in 1999. W: Why do you choose Street dance? M: I found that this class is the most interesting. W: Oh really? Tell me more about it. M: Well, Street dance uses its music, its basic movements, and also its freedom for self-expression. W: It sounds like an aerobics class. M: Not exactly. The participants and the instructor are dressed in their ordinary casual wear. Moreover, the music they use is not the dancing music that an aerobics class usually uses. W: s that the main differences from normal aerobics? M: No, Street dance is a lot more tiring. W: Does it mean you feel like you've been tired out? M: Ha, no. I think it is a good way to relax. W: Is there any age or skill level limit for entering? M: No. In our class, the youngest student is 15 and the oldest is 50. And everyone can choose whatever difficulty level he or she wants to. W: Sounds interesting. I'll go with you next time. (20)