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