Unit4Reading-陈媛.ppt

PartOne:LeadinWhatisthis?,Whichplanetisitshome?,ThisisChangJiang7.Itisanalien（外星的）dogfromoutspace.,Canyouguess?,海王星Neptune,水星Mercury,金星Venus,地球Earth,火星Mars,木星Jupiter,土星Saturn,天王星Uranus,Pluto,ScientiststhinkPlutoistoosmalltobecalledaplanet.,Goodbye!,Lifeisbeginning,Unit4ReadingHowLifeBeganontheEarth,PartTwo:Aguessinggamesharpeyes,remeberquickly,Whatcanyouseeinthevideo?,BigBang,globe,atom,violentsurface,water,reptile,alien,eggs,mammals,fish,humanbeings,dinosaur,cowboy,atmosphere,Mainidea,Afterwatchingthevideoclip,whatisthemainideaofthispassage?,Abriefintroductiononhowthe_developedandhow_beganontheearth.,life,earth,Para.1Para.2Para.3Para.4Para.5,Atheoryabouthowtheuniverse（宇宙）wasformed,Theformation(形成)oftheearth,Theimportanceofwaterforlife,Thedevelopmentofplantsandanimals,Thearrivalofhumansandtheireffectsontheearth,Part1:Thedevelopmentof_,Part2:Thedevelopmentof_,PartThree:Fastreading,theearth,life,PartFour：CarefulReading,Stage1:Thedevelopmentoftheearth(para1-3)Task1:Fillintheformonlearningplanpaper.(para1-2),(tips:Readthepassagecarefully,findsomedetailedinformation),Atoms,acloudofdust,asolidglobe,create,violent,atmosphere,produce,Water,appear,cooleddown,BigBang,atom?,Atmosphere,Asolidball,water学.科.网.,Acloudofdust,Task2(para3),1.Whywastheearthdifferentfromotherplantes?2.Whyiswatersoimportantforthebeginningoflife?,Task2:1.Whywastheearthdifferentfromotherplantes?A.ItproducedalotofheatB.ThewaterremainedontheearthC.AcloudofdustwasaroundtheearthD.Itwastheoldestplanet,2.Whyiswatersoimportantforthebeginningoflife?,Becausewaterallowedtheearthtodissolveharmfulgasesintooceansandseas,whichmadeitpossibletodeveloplife.,Task3:Readpara(4-5)andputthedevelopmentoflifeintimeorder.(tips:Findoutandunderlinekeyphraseswhichcanshowatimeline,suchas.later,.ago),Stage2:Thedevelopmentofthelife(para4-5),Manymillionsofyearslater,thefirstextremelysmallplantsbegantoappearonthesurfaceofthewater.Theymultipliedandfilledtheoceansandseaswithoxygen,whichencouragedthelaterdevelopmentofearlyshellfishandallsortsoffish.Next,greenplantsbegantogrowonland.Theywerefollowedintimebylandanimals.Somewereinsects.Others,calledamphibians,wereabletoliveonlandaswellasinthewater.Laterwhentheplantsgrewintoforests,reptilesappearedforthefirsttime.Theyproducedyounggenerallybylayingeggs.Afterthat,somehugeanimals,calleddinosaurs,developed.Theylaideggstooandexistedontheearthformorethan140millionyears.However,65millionyearsagotheageofthedinosaursended.Whytheysuddenlydisappearedstillremainsamystery.Thisdisappearancemadepossibletheriseofmammalsontheearth.Theseanimalsweredifferentfromalllifeformsinthepast,becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.,Finallyabout2.6millionyearsagosomesmallcleveranimals,nowwithhandsandfeet,appearedandspreadallovertheearth.Thustheyhave,intheirturn,becomethemostimportantanimalsontheplanet.Buttheyarenotlookingaftertheearthverywell.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.Asaresultofthis,manyscientistsbelievetheearthmaybecometoohottoliveon.Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.,想一想,（）Insectsandamphibiansappeared.（）Dinosaursappeared.（）Smallplantsgrewonthewater.（）Reptilesappeared.（）Greenplantsbegantogrowonland.（）Shellfishandotherfishappeared.（）Cleveranimalswithhandsandfeetappeared.（）Mammalsappeared.,1,2,3,4,5,6,7,8,Greenhouseeffect,Task4:Whatproblemiscausedbyhumanbeings?(para5),puttingtoomuchcarbondioxideintotheatmosphere,preventsheatfromescapingfromtheearthintospace,toohottoliveon,Whetherlifewillcontinueontheearthdependsonhumanbeings.,Onlyifwecarewillwehelp;onlyifwehelpshallallbesaved!,Longlongago,thereisanancientcitycalledHandan.,HandanCongtai,FuyangRiver,亲，我是康德，我在雾霾中.,空气污染，光靠戴口罩可不管用.,PartFive:Discussion,Discussingroupsandgiveareporttotheclass.,Howcanwecontroltheairpollutionandmakeourcityabetterplacetolivein?,summary,Afterthe“bigbang”,theearthwasstilljustacloudof_,it_loudlywithfireandrock,whichwere_toproducethe_,watervapourandothergases.Then_begantoappearontheearth.,dust,exploded,intime,carbon,water,_inwaterareconsideredtobetheearliestlivesontheearth.Theoxygensupplyencouragedthelivesof_.Slowly_grewonland,whichwerefollowedby_likeinsects&_.Whentheplantsgrewinto_,_appeared.Then_developedbutdisappeared