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题目材料:

In which of the following pairs of years were the ratios of Republican receipts to Democratic receipts most nearly equal?
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A.1981-82 and 1985-86
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B.1983-84 and 1995-96
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C.1987-88 and 1989-90
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D.1987-88 and 1995-96
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E.1991-92 and 1993-94
C显示答案