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Eat . Eating
Swim. Swimming
Run. Running.
What is it?
It is a bird.
What is it doing?
It’s flying.
（两人合作对话）
猜一猜小动物在干什么？
A: What is it?
B: It’s a monkey.
A:What is it doing?
B:It's playing.
A: What is it?
B: It’s a cat.
A:What is it doing?
B:It's jumping.
A: What is it?
B: It’s a cow.
A:What is it doing?
B:It's eating.
A: What is it?
B: It’s a fish.
A:What is it doing?
B:It's swimming.
A: What is it?
B: It’s an elephant.