企源知识库

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
【题目解析】：本题考查美国的人口流动。根据课本P186可知，美国历史上共有四次大型的人口流动。