第一部分听句子选出正确应答句，每个句子读两遍。
1. A. That's a good idea. B. Let's make a plan. C. It's the longest wall in the world.
2. A. Nice to meet you. B. Thanks a lot. C. Do you have to?
3. A. Yes, I'd love to. B. Yes, please. C. No, I didn't.
4. A. It's my pleasure. B. I'm sorry to hear that. C. Never mind.
5. A. Two days ago. B. Next week. C. On the playground.
