单项选择题

A．The influence of old people in the U.S.
B．Changes in American families.
C．Citizens and life in the U. S.
D．The old people in the U. S.
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单项选择题
A．They do routine work and speak a few languages.B．They see the world and earn a lot of money.C．They look pretty and look after passengers.D．They see the world and do routine work.
A．They do routine work and speak a few languages.
B．They see the world and earn a lot of money.
C．They look pretty and look after passengers.
D．They see the world and do routine work.
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