单项选择题
（）was an important immigration spot in late 19th century and early 20th century.
A.Ellis Island B.San Francisco C.Hawaii D.Miami
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（）
单项选择题 The annual population growth rate of the 1990s was （）
