Sittingstillandkeepingquietseemslikewhatstudentsshouldd...
问题详情:Sittingstillandkeepingquietseemslikewhatstudentsshoulddoinclass.However,puttingyourfeetonthetable,usingiPads,eatinganddrinkingmayalsotakeplaceinschool.Americansarefamousfortheircasual(随意的)s...