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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
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单项选择题Why doesn't the man want to change his work schedule

A．All the other work schedules conflict with his classes.
B．He doesn't want to ask his boss for another favor.
C．He wants to work the same schedule as his friends.
D．He likes to do his homework in the evenin

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