单项选择题

What influences the birth rate most in the United States is ______.

A．highly paid jobs
B．women's desire for independence
C．expenses of child raising
D．high divorce rate
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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
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
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