- 问题详情: MissCooperwasateacherworksataschoolforboysandgirls.Shetaughtthechemistryforallthestudentsfromdifferentgradeintheschool.Sometimesthenewclasseslearnedrapidly,butsometimestheywereslowly.Oneday,oneoftheclasseshasbeenstudyingforminuteswhileMissC...
- 16536