单项选择题

The word "demographers" ( Line 1, Paragraph 7 ) most probably means ______.

A．people in favor of the trend of democracy
B．advocates of migration between states
C．scientists engaged in the study of population
D．conservatives clinging to old patterns of life
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单项选择题
We can see from the available statistics that ______.
A．California was once the most thinly populated area in the whole US
B．the top 10 states in growth rate of population were all located in the West
C．cities with better climates benefited unanimously from migration
D．Arizona ranked second of all states in its growth rate of population
单项选择题
Discerned from the perplexing picture of population growth the 1980 census provided, America in 1970s ____.
A．enjoyed the lowest net growth of population in history
B．witnessed a southwestern shift of population
C．underwent an unparalleled period of population growth
D．brought to a standstill its pattern of migration since World War Ⅱ
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