阅读对话,回答问题。(6分)
Jack:Hello,Tom.
Tom:Hello, Jack. What are you doing now?
Jack:We are making a big zoo.
Tom:Really?
Jack:Yes. I made a lion and a hippo.
Tom:How cute they are! Whose zebra is that?
Jack:It's Ann's.
(1)What is Jack doing?
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(2)What did Jack do?
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(3)Whose zebra is that?
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