Sittingstillandkeepingquietseemslikewhatstudentsshouldd...
問題詳情：Sittingstillandkeepingquietseemslikewhatstudentsshoulddoinclass.However,puttingyourfeetonthetable,usingiPads,eatinganddrinkingmayalsotakeplaceinschool.Americansarefamousfortheircasual(隨意的)s...