单项选择题

What does the passage mainly discuss

A．The economic development of the United States in the eighteenth century.
B．Ways in which economic development led to social changes in the United States.
C．Population growth in the western United States.
D．The increasing availability of industrial jobs for women in the United States.
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单项选择题
With which of the following opinions would the author be likely to agree
A．Women's lives significantly improved as the United States economy expanded.
B．Women had more opportunities for employment in the western United States than in other regions.
C．The home after 1820 was a superior social entity to that of the eighteenth century.
D．Increased social fragmentation negatively affected middle class family.
单项选择题
According to the passage, as the nineteenth century progressed, the people of the United State ______.
A．emigrated to other countries
B．often settled in the West
C．tended to change the place in which they lived
D．had a higher rate of birth than ever before
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