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單項選擇題

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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單項選擇題

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

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