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题目材料：
Approximately what was the ratio of the area of the non federal rural land in Maryland to the total area of the nonfederal rural land in the contiguous United States in 1997?
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A.$$\frac{1}{3}$$
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B.$$\frac{1}{30}$$
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C.$$\frac{1}{300}$$
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D.$$\frac{1}{3,000}$$
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E.$$\frac{1}{30,000}$$
C显示答案
