【单选题】【消耗次数：1】
One big of formal education is the high cost.
①
advantage
②
disadvantage
③
problem
④
condition
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相关题目
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low
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【单选题】
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随机题目
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气焊作业时乙炔瓶应直立，与氧气瓶之间距离不小于5m
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作业完毕应清理现场，确认无残留火种后方可离开
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