单项选择题

A chief factor in bringing down the births in Europe in the 19th century is ______.

A．birth control
B．the desire to seek fortune in cities
C．the instability of marriage
D．the changed place of women
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单项选择题
During the years from 1957 to 1976, the birth rate of the United States ______.
A．increased
B．experienced both falls and rises
C．was reduced
D．remained stable
单项选择题
It can be inferred from the passage that by 1860 ______.
A．half of the population lived to the west of Appalachian Mountains
B．Americans had long been desirous of new territories
C．westward expansion was a solution to the conflicts between the two parties
D．America's industry was highly developed
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