选择正确的句子补全对话，只写序号。
A. They're chickens.
B. What are they?
C. How many eggs?
D. It's very fat.
E. Twelve eggs!
A: Hello, boys and girls. This is our farm.
B: Look! _______
A: They're cows.
B: Look at these. What are they?
A: _______
B: So many eggs!
C: _______ Let's count.
B: One, two, three...twelve. _______
C: Oh, look at the pink pig. _______
B: And that pig is thin.
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