从方框中选择合适的选项补全对话。
A. Are they ducks?
B. What are these?
C. Are they cows?
D. How many cows do you have?

: Welcome to my farm.

: Wow! Your farm is so big.
【小题1】
: They are pigs.

: What about those?
【小题2】
: Yes, they're cows.

:
【小题3】
: Twenty.

:
【小题4】
: No, they aren't. They are hens.

: They are so fat and cute.