A. What's that? B. It's a door. C. It's a yellow ball. D. What's this?
A. Thank you.
B. What's this?
C. How are you?
D. Good morning,
E. It's a chair.
A:Good morning, Lingling.
B: Ms. Smart.
A:
B:I'm fine, thank you.
B:It's a desk.
A:What's that?
B:
A:Sit down, please, Lingling.
例:—What's this?
—It's a cap.