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课件15张PPT。UNIT ONE WHY ARE YOU SO HAPPYLesson 1Look and learnhappyLook and learnsadLook and learntiredLook and learnangryLook and learnafraidLook and learnsurprisedWhy are you so happy?Because we are back to school?Why are you so angry?Because my son’s room is messy.Why are you so tired?Because I pla...