單項選擇題Between 1845 and 1854,about 1.5 million Irishmen emigrated to United States because of（）

A.famine　
B.English oppression
C.war　
D.Both A&B


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1.單項選擇題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

2.單項選擇題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

4.單項選擇題One of the reasons for the growth of population in Florida is because of its（）

A.expanding economy
B.large number of Cuban-Americans
C.climate
D.exotic food

5.單項選擇題The three states that have seen the fastest growth in population in the past 20 years are（）

A.California,Arizona and New Mexico
B.California,Florida and Nevada
C.New Mexico,Texas and Florida
D.Arizona,Nevada and Florida