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A trend that occurs at the same time with the movement to the South and the West of t
A.the flow of people to sunbelt area
B.the flow of people from small cities to big cities
C.the growth of small towns
D.the outflow of city residents from the core cities to the suburbs
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)