单选题
According to the passage as the nineteenth century progressed, the people of the United States______.
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
【正确答案】
C
【答案解析】
事实细节题。选项A明显错误，文章提到有移民移居美国，但未涉及美国人移居国外；选项B涉及美国人的搬迁，但并非局限于西部；选项D与原文刚好相反。虽然人口增长了近一倍，但增长率下降；选项C与原文的geographic mobility相符，故为正确答案。
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