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- 問題詳情： MissCooperwasateacherworksataschoolforboysandgirls.Shetaughtthechemistryforallthestudentsfromdifferentgradeintheschool.Sometimesthenewclasseslearnedrapidly,butsometimestheywereslowly.Oneday,oneoftheclasseshasbeenstudyingforminuteswhileMissC...
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