According to historians and specialists in demography,there are（）great population movement(s)in the history of the United States.<br>A:four<br>B:three<br>C:five<br>D:None of the above

According to historians and specialists in demography,there are（）great population movement(s)in the history of the United States.
A:four
B:three
C:five
D:None of the above

出自：00522《英语国家概况》

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