3、天的时间各自负责背诵。关于PPT,有愿意负责做的吗?若没有,我来。I.IntroductionTwomainfestivalsintheworld:Christmas or ChristmasDayisanannualfestivalcommemorating thebirth of JesusChrist, observedmostcommonlyon December25asareligiousandculturalcelebrationamongbillionsofpeoplearoundtheworld.ChristmasDayisapublic