Unit4Roadsafety,Learningaims（学习目标）:Icanunderstandthestorywiththehelpofpictures.Iknowhowtocrosstheroadsafely.Icantellothersaboutroadsafety.,trafficlights,redman,greenman,apavement,azebracrossing,Howtocrosstheroadwithoutazebracrossing,Whatyoumustntdoontheroad,1,2,3,Matchthepicturesandsentences,Howtocrosstheroadwithazebracrossing,Therearemanybusyroadsinthecity.Howcanyoucrossthemsafely?,First,youmustlookfor_.Then,youmustlookatthe_andwaitforthe_.,azebracros
