OK旁白：OnedaySamanthaCandyandJujoareplaningfortheirSummerholiday. 　　a:Wherewouldyouliketogo? 　　b:Iwanttoswim. 　　c:ButIcan'tswimanditistoocrowdedthere.soIdon'twanttogothere．ＨowaboutgoingtoBeijing? 　　a:CanBeijingofferusalotoffun? 　　c:Yes.WecanvisitalotoflandmarksinBeijing,suchastheSummerPalaceandtheTian'anMenSquare.Theyareallbeautiful. 　　b:Ok,let'sgotoBeijingforourSummerholiday. 　　旁白:InSummerholiday,Samantha,CandyandJujowerevisitingBeijingtogether.TheyvisitedtheSummerPalace,theGreatWallandtheTian'anMenSquare.Buttheyweren'thappy.BecausetheythoughttheairinBeijingwasn'tcleanandtheairpollutionwasnotgoodfortheirheath.Oneweeklater,theycameback.) 　　a:Oh!TheairinBeijingisverydirty.It'sbadforourheath. 　　b:Yes.That'sairpollution.Howcanwecleantheair. 　　c:Wecanplantmoretrees. 　　a:Why? 　　b:Oh!Iknow.Thetreestakeharmfulgasfromtheairandreleaseoxygenintotheair.Theycanlelpustocleantheair. 　　c:Yes.That'strue.Treesareuseful.Theyanmakestreetsmorebeautifulandlessnoisy.Andthefruitandthenutsforcola,andthebeasforthecoffeealllcomefromtrees. 　　a:Wow.Thetreesaregreat.Arethewoodinourpencilandpaperinournotebooksallfromtrees? 　　b,c:Yes,theyareallfromtrees. 　　a:Treesarereallyuseful.Whydon'tweplantalotoftreesinourcity.Andtheairinourcitywillbecomecleanorourcitywillalsobecomemorebeautiful. 　　b:That'sagoodidea.Let'sgoandplantsometreesnow. 　　a,c:Ok,let'sgo. 　　旁白：SamanthaCandyandJujoareplantingtreesintheircity.Theircitiesbecomemorebeautiful.Wecanalsoplanttreesinourcity.That'sgoodforourheath.Andtheairinourcitywillbecomecleaner. 　　TheEnd.