单项选择题

The author believes that ______.

A．the motion of the plates corresponds to that of the earth's interior
B．the geological theory about drifting plates has been proved to be truse
C．the hot spots and the plates move slowly in opposite directions
D．the movement of hot spots proves the continents are moving apart
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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
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
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