从方框中选择合适的内容，补全对话。
A: Good morning, Lingling.
_________________B:
_________________, thank you.
A:
_________________B: It's a desk.
A: What's that?
B:
_________________A: Oh! What are those?
B: They're birds.
A. It's a chair.
B. How are you?
C. What's this?
D. I'm fine
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