根据你所听到的问句,选出正确答句。 ( ) 1. A. Yes, I do. ( ) 2. A. Yes, I am. ( ) 3. A. Fifty. ( ) 4. A. Sure. Here you are. ( ) 5. A. It's a hot dog. B. Yes, I am. B. That's true. B. Fifty yuan. B. You're welcome. B. That's OK. C. Yes, I did. C. I'm going to see a Beijing opera. C. Fifty kilos. C. Thank you. C. It's hot and rainy.