听录音，选择正确的应答句。（听两遍） (     )1.A. It's Sunday. (     )2.A. Yes, I do. (     )3.A. The red one is. (     )4.A. Thank you. (     )5.A. No, it doesn't. (     )6.A. Yes, I am. B. It's the 6th of May. B. Yes, I am. B. She's Helen. B. You're welcome. B. Yes, I am. B. That's true. C. It's on the 6th of May. C. Yes, I did. C. Helen's is. C. Sure, here you are. C. No, it means 'No smoking'. C. I'm going to see a Beijing Opera.