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正确答案A
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正确答案A
