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
The census distinguished itself from previous studies on population movement in that ______.
A．it stresses the climatic influence on population distribution
B．it highlights the contribution of continuous waves of immigrants
C．it reveals the Americans' new pursuit of spacious living
D．it elaborates the delayed effects of yesterday's "baby boom"
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