单项选择题

Which of the following can account for a large part of the high American mobility rate

A．Divorce and morality.
B．Expansion of industry and commerce.
C．Changes in the labour force.
D．None of the abov
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单项选择题
The phrase encroach upon in Paragraph 2 most probably means ______.
A．"buy and sell"
B．"measure and survey"
C．"invade and occupy"
D．"rent and share"
单项选择题
According to the fifth paragraph, Americans who change their jobs usually ______.
A．prefer small towns to big cities
B．feel reluctant to move more than several miles away
C．thinks it worthwhile to move to a foreign country
D．dislikes moving to faraway places
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