补全对话。
Amy: Hello, Sam. What are you doing?
Sam:
1． That’s very interesting.
Amy: Oh, tell me more about Beijing.
2．Sam: It’s got about twenty million people.
Amy: Wow! That’s very big.
3．Sam: Yes, it is. And there’s a famous Great Wall in Beijing.
Amy: Really?
4．Sam: It’s more than twenty thousand kilometres long.
Amy: Wow! It’s really long. I want to visit it some day.
5．Sam: Yes, I’d love to.
| A．How big is it? |
| B．Is it very old? |
| C．I’m reading a book about Beijing. |
| D．How long is it? |
| E．Can you go with me? |
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