Unit9SavingtheearthPeriod1Let'slistenandspeak!Goals◆Talkaboutnature,ecologyandtheenvironment◆Practicesupportinganopinion◆Learntouseinversion◆WriteanevaluationparagraphProceduresLeadingin(1):byaskingaseriesofquestions.(lockstepwork,approx.5min)Hello,boysandgirls.Asweallknow,theearthistheonlyhomeoftheman.Doyouthinkitisbeautiful?Yes.Iagreewithyou.Canyounamesomeplacesofinterestintheworld?Quiteright.Wehavealotofplacesofinterest,theGreatWall,theWestLake,ZhangJiajie,Jiuzaigou,NiagaraFalls.Doyouthinkitisnecessaryandimportantformantoprotecttheearth?Yes,ofcourse.Haveyoueverthoughtthattheearthisalsoverydirty,veryugly,Imean,notbeautiful?Believeitornot,theearthisgettingdirtieranddirtier.Lookatthepicturesonpage65,please－rivershavebeenpolluted,rubbishiseverywhere,factorychimneyshavegivenofftoomuchsmokecausingalotofacidrainallovertheworld,whichhasdamagednotonlycrops,butalsoplants.Besides,manhimselfalsohasdoneagreatdealofharmtotheenvironment.Now,I'dliketoaskyouafewquestions:1.Iftoomanytreeswerecutdown,whatwouldhappen?(Answer:1.Soillost.Iftoomanytreeswerecutdown,theenvironmentwouldbegreatlyaffected.Therichsurfacesoilwouldbeblownawaybywind,orwashedbyraindownthehillsandintorivers.)2.SilkRoadonceplayedanimportantpartinforeigntradeinChina.Butnowitiscoveredwithsand.Whatcausedit?(2.Cuttingtreesanddesert.)3.Howmanypeoplearesufferingfromhunger?Howmanypeopledieofhungereveryyear?(3.About500millionpeopleintheworldaresufferingfromhungerandabout40millionpeopledieofhungereveryyear.)Nowopenyourbooks,turntopage65.Andlet’slearnUnit9.Leadingin(2):bydiscussion.(lockstepwork,approx.5min)Hi,everyone.Wearelivingontheearthandwearecitizensoftheearth,whichisthehomeofusall.Soitisourdutytotreatitwell.Butinactualfact,manhasbeenbadlytreatingtheearth.Inordertogetenoughfood,waterandothermaterialstoraisethelargeandincreasingpopulation,manhasmadealotofusefulinventions.However,thisinreturnhasdonetoomuchdamagetoourmotherearth.Now,youwillbedividedintogroupsoffouranddiscusswhatkindsofdamagemanhasdonetotheearth.ThenI’llasksomeofyoutoreporttheresultstothewholeclass.(Teacherwriteswhatthestudentsreportontheblackboard,eachstudentreportsone.)用心爱心专心115号编辑Morefactsaboutenvironment★TheWashingtonStateferrysystemannounceda“clean-dieselfuelinitiative”thatwillcutnearly10,000tonsofpollutantemissionsfromitsfleetof25ferries,largestinthenation.Dieselengineshavebeenupgradedtoburnlowersulfurdieselfuel.华盛顿州的渡船运输系统宣布：“主动采用清洁柴油”。这将使全国最大的由25艘渡船组成的船队减少污染排放量近一万吨。柴油发动机已经升级换代，以便使用含硫量低的柴油。★Acidraincausesacidificationoflakesandstreamsandcontributestodamagetotreesandmanysensitiveforestsoils.Inaddition,acidrainacceleratesthedecayofbuildingmaterialsandpaints,includingirreplaceablebuildings,statues,andsculpturesthatarepartofournation'sculturalheritage.Beforefallingtotheearth,sulfurdioxideandnitrogenoxidesgasesandtheirparticulatematterderivatives,sulfatesandnitrates,contributetovisibilitydegradationandimpactpublichealth.酸雨造成湖泊与河流酸化，导致多种树木与敏感森林土壤受损。不仅如此，酸雨加速了建筑材料及颜料的腐烂与衰退，包括不可再生建筑、雕像和雕刻，而这些都是我们国家的文化遗产。在降落到地面之前，二氧化硫和氮氧化合物气体以及它们的微粒物质衍生物，硫酸盐，硝酸盐会降低能见度，影响公共健康。用心爱心专心115号编辑★ByreducingSO2andNOX,manyacidifiedlakesandstreamswi...
