1. 给下列句子选择合适的应答语，然后进行对话练习

⑴What can you hear?    ⑵Can you see a bus?    ⑶What can you see?    ⑷Is this a ship?

A. Yes, I can see a bus. B. I hear a car. C. No. It's a train. D. I see a dog.