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單項(xiàng)選擇題

The immigrants spread unevenly across the country,with（）having the largest percentage of immigrants.

A.Northeast
B.the West
C.Midwest
D.the South

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單項(xiàng)選擇題

A major source of population growth is（）

A.immigration　
B.baby boom
C.rising birth rate　
D.larger number of young people

單項(xiàng)選擇題

The annual population growth rate of the 1990s was （）

A.1%
B.0.9%
C.over 1%
D.under 1%