4．
补全对话
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A. Look, this is our new playground.
B. Thank you.
C. What was your school like eight years ago?
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Mike: Welcome to our school!
John： Tell me about your school，please.
Mike: OK.
John: Wow！The playground is so big!
Mike: But there was a small playground.
John：
Mike: There was no gym or library. The students couldn't use computers. Now
there are two gyms, a library and forty computers.
