1. 从方框中选出下列各句的最佳应答语。

A. Thank you. B. Great! C. I'm seven years old. D. Nice to meet you. E. Three.

1. （1） How old are you?
3. （2） How many books?
5. （3） Happy birthday!
7. （4） Let's eat the bread!
9. （5） This is my brother.