Lesson42课件
日期：2010-06-10 06:35
2003DroughtforthelastfouryearsandnotagoodcropinthisseasonhaveresultedinhighpricesofvegetablesWhathappenedtothecity?SandStorminbigcitiesinNorthChina1Whatcanyouseeinthispicture?2Whatshouldwedotochangethedesertintoagreenworld?1plantmoretrees2protecttheland3stopcuttingdownthetreesTheGreatGreenWallItwasbuiltin1978acrossthenorthernpartofChinaItgoesacrosstheNorthwest(Xinjiang，Nov11，whichcovers424%(percent)ofthelandofChinaThebuildingoftheGGWwilltake73yearsItwillchangeChina’senvironmentandhelpdevelopheragricultureandforestry，069，Qinhai，Gansu)theNortheastandthenorthernpartofNorthChinaincluding13provinces，000squarekilometers，animalhusbandryandeconomyinthoseareasWhatcanforestshelptodo?keepwaterfromrunningaway，citiesandautonomousregionsItstotalareais4，AnoldAfghanvendorcarriesasackofcarrotsonhisbackfromavegetablemarketinKabulTuesday，nodroughtwillhappenkeepraindropsfromhittingthesoildirectlySoilisnoteasilywashedaway3Deadleaves…keepwat，
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