单项选择题
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
单项选择题 （）was an important immigration spot in late 19th century and early 20th century.
单项选择题 The immigrants spread unevenly across the country,with（）having the largest percentage of immigrants.
单项选择题 A major source of population growth is（）
