單項(xiàng)選擇題Up to the end of WW II,there were（）waves of large-scale emigration to the United States.
A.four
B.two
C.three
D.None of the above
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1.單項(xiàng)選擇題The population between the age of 25 and 44 increased by 28.1%from 1980 to 1989 because（）
A.this was the period of large inflow of young immigrants
B.this was the birth age of the baby boomers.
C.the large number born during WW II reached this age bracket
D.those who were born in the period of baby boom reached this age bracket
2.單項(xiàng)選擇題More than（）of the population in the United States lived in city areas in 1988.
A.60%
B.75%
C.90%
D.50%
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