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题目材料:

What is the median unemployment rate for 25 to 64 year olds in those countries for which more than 15 percent of 25 to 64 year olds had a level of educational attainment of a two-year college degree or higher?
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A.5.6%
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B.6.2%
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C.6.8%
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D.7.8%
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E.8.8%
B显示答案