單項(xiàng)選擇題According to historians and specialists in demography,there are（）great population movement(s)in the history of the United States.

A.four　
B.three
C.five　
D.None of the above


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1.單項(xiàng)選擇題During the third wave of immigration from 1890 to 1910,many came from（）

A.Britain and the Netherlands　
B.Austria-Hungary and Russia
C.Japan and China
D.Mexico and Cuba

2.單項(xiàng)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

3.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

4.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