1. 为下列句子选择合适的答语。

A. Yes, it is. B. It's about London. C. I'm from China. D. No, she isn't. E. It's Big Ben.

1. （1） —Is that your book?

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3. （2） —Is this your mother?

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5. （3） —Where are you from?

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7. （4） —What's that?

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9. （5） —What is it about?

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