仿照例子写一写。
A: Here is the map of the U.S. B: I know about the U.S.
A: What's the capital city of the U.S.? B: Washington,D.C. is the capital city of the U.S.
A: What do they speak in the U.S.? B: They speak English.
A: What colour is the flag of the U.S.? B: The flag of the U.S. is red,white and blue.
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