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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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
单项选择题
The primary purpose of this passage is to ______.
A．criticize the belief of manifest destiny
B．justify American westward expansion
C．explain why Americans expanded westwards
D．explain Americans' racism
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