3．
听对话，选择恰当的单词把对话补充完整。
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library pictures classroom
twenty maps
thirty
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A: Do you have a big and beautiful ?
B: Yes, I do. It is next to the .
A: Are there any on the wall?
B: No, there aren't. There are some .
A: How many students are there in your class?
B: There are boys and girls.
A: That's great!
