读一读，回答问题。

A: What are you doing?

B: I'm watching my friends.

A: Where are they?

B: They are in the park.

A: What are they doing?

B: Jack is eating. Lucy is drinking. Peter is catching butterflies.

A: Whose dog is that?

B: Oh, that is Petty. That's Peter's dog.

1. What is Jack doing?

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2. Is Lucy listening to music?

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3. What is Peter doing?

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4. Whose dog is that?

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苗木年龄是依据什么计算的？1-0；1-2；1⑵-1等苗龄型表示什么意思？