回答问题，并填空。A:Whatisit?B

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A: What is it?2J9`0O.r6H(l:g

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B: Where do you write on it?2J9`0O.r6H(l:g

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C: Where do you put the address?2J9`0O.r6H(l:g

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D: Where do you put the stamp?2J9`0O.r6H(l:g

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