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)

A. How to lose weight.
B. Street dance.
C. Exercising in a gym.
Dancing music.