人教版英语高一下学期必修3 Unit4 Astronomy readingPPT课件.ppt

Unit4Astronomy:thescienceofthestars,WarmingupandReadingI,Warmingup,Whatarethenamesoftheeightplanetsthatcirclearoundthesun?,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,theSun,Warmingup,Whatarethenamesoftheeightplanetsthatcirclearoundthesun?,Whatinterestsyouinastronomy?Doyouknowanyquestionsthatastronomersareinterestedin?,Warmingup,Howtheuniversebegan?Howlifebegan?Istherelifeonotherplanets?Arethereotherlifeformsintheuniverse?,1.Theoriginoflifeonearthisaquestionthatinterestsastronomers.Whatdoyouknowaboutit?Howoldistheuniverse?Howoldistheearth?Whichwerethefirstcreaturesorplantsonearth?,Pre-reading,Howoldistheuniverse?(severalbillionyearsago)Howoldistheearth?(between4.5and3.8millionyearsago)Whichwerethefirstcreaturesorplantsonearth?(verysmallair-breathingcreatures),Pre-reading,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),StudyofthegroupsoflifeLookatthepicturesandtellthegroups.,2.Eachreligionandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?InChina,weallknowthatPanguseparatestheskyfromtheearth.,Pre-reading,Panguseparatestheskyfromtheearth,Panguseparatedtheearthandskywithanax.Afterhedied,hisbreathbecamewindandcloud;hisvoicebecamethunderandhislefteyesunandrightonemoon;armsandlegsbecameedgesandmountains;bloodbecameriversandtendon(筋脉)becameroads;musclesbecamefieldsandhairstars;teethandbonesbecamemineralsandrock;sweatbecamerain.,Thebeginningofthelife,PanguseparatedNvwacreatedGodcreatedtheskyhumanstheworld盘古开天女娲造人上帝创世论,TheBiblicalAccount,Day1:GodspokeandseparatedlightfromdarknesscreatingDayandNightDay2:GodspokeandseparatedthewatercreatingskyandoceanDay3:Godspokeandcreateddryland,Day4:Godspokeandcreatedthesun,moonandstarsDay5:GodspokeandcreatedlivingcreaturesintheairandseaDay6:GodspokeandcreatedthelandanimalsandmanDay7:GodrestedandblessedthisdaycallingitHoly,Readthetitleandlookatthepictures.Predictwhatthereadingwillbeabout.,Pre-reading,ReadingHowlifebeganontheearth,TheBigBang,BigBang,Asolidball,Theearth,Atmosphere,Skimming,Readingstrategy(策略):Gothroughthepassagequicklytogetthemainideaofeachparagraph.,Skimthepassageandmatchthemainideawitheachparagraph.,Para.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.,Acloudofdust,Afterthe“BigBang”,theearthwasjustacloudofenergeticdust.,Asolidball,Whatitwastobecomewasamysteryuntilthedustbegantoslowlycombineintoaballmovingaroundthesun.,Violentearth,Theproblemwasthattheearthbecameviolentbecauseitwasnotclearwhetherthesolidshapewastolastornot.Itexplodedloudlywithfireandrock,Atmosphere,Whichwereintimetoproducethewatervapour,carbondioxide,oxygen,nitrogenandothergases,whichweretomaketheearthsatmosphere.,Presenceofwater,Astheearthcooleddown,waterbegantoappearonitssurface.Nobodyknewthatitwasgoingtobedifferentfromotherplanetsgoingroundthesun.,Waterstayed,WaterhadalreadydisappearedfromplanetslikeMarsorsatelliteslikethemoon,butitstayedontheearth.,Moon,Mars,special,Thisishowtheearthbegantoshowitsspecialqualities.Manypeoplethinkthatthiswasimportantforthebeginningoflife.,Harmfulgases,Itallowedtheearthtodissolveharmfulgases,whichhadbecomepartoftheearthsatmosphere,intotheoceansandseas.,Possiblelife,Thatmadeitpossibleforlifetobegintodevelop.,Whyiswaterimportantontheearth?,Questions,Becausewaterallowedtheearthtodissolveharmfulgasesintotheoceansandseas.,Nowpleasereadpara.4！,Smallplantsgrowonthewater,Whatscientiststhinkisthattheearthwasdifferentbecauseofthearrivalofsmallplantsgrowinginthewateronitssurface.,Oxygen,Nobodyunderstoodthattheseplantswerethestartofmanychanges.Theymultipliedandfilledfirstoceansandseaswithoxygen.,Shellfishandotherfishappear,Thisencouragedthedevelopmentofearlyshellfishandallsortsoffish.,Plantsbegantogrowondryland,Manymillionsofyearslaterthefirstgreenplantsbegantoappearonland.,Carbondioxide,Scientistsbelievethattakingcarbondioxidefromtheatmosphereandfillingtheairwithoxygenhelpedlifetodevelop.,Insectsappear,Laterlandanimalsappeared.Somewereinsects.,Amphibiansappear,Others,calledamphibians,wereabletoliveonlandaswellasinthesea.,Reptilesappear,Whentheplantsgrewintoforests,reptilesappearedforthefirsttime.Theyproducedyounggenerallybylayingeggs.,Dinosaursappear,Later,somehugeanimals,calleddinosaurs,developed.Theylaideggstoo.Theybecamethemostimportantanimalsontheearthformillionsofyears.,Mammalsappear,Butwhentheydisappeared,mammalsbecamemoreimportant.Theywerethelastgroupofanimals,Produceyoung,andtheyweredifferentbecausetheyproducedtheiryoungfromwithintheirbodies.,1.Smallplantsinwater,2._andallsortsoffish,3.Green_onland,4._(onland),5.Amphibians(onlandandin_),6.Plantsgrewinto_.,8._(onland),9._(onland),Haveatry:Talkingaboutthedevelopmentoflife,7._(onland),10._(smallcleveranimalsonland),Shellfish,Insects,water,plants,forests,Reptiles,Dinosaurs,Mammals,Humanbeings,Scanning,Puttheorderofdevelopmentoflifeintoatimeline.,Scanning:Puttheorderofdevelopmentoflifeintoatimeline.,1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust.9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared.,2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.Theuniversebeganwitha“BigBang”.12.Mammalsappeared.,Key:107384961521211,Animalswithfourlegsandfeet,Smallcleveranimals,nowwithhandsandfeet,appearedandspreadallovertheearth.,Humansappear,Theydevelopednewmethodsofgrowingfood,huntingandmovingaround.Astimewentbytheycoveredtheearthandhavebecomethemostimportantanimalsontheplanet.,Greenhouseeffect,Buttheyarenottakingcareoftheearthverywell.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.,Toohot,Theearthmaybecometoohotforthelivesonit.,future,Whetherlifewillcontinueontheearthformillionyearstocomewilldependonwhetherthisproblemcanbesolved.,Closereading,1.Whywastheearthdifferentfromtheotherplanets?2.Whydidtheplantsgrowbeforetheanimalscame?3.Whyisitwrongtoshowfilmswithdinosaursandpeopletogether?4.Thereusedtobenineplanetsinthesolarsystem.Recentlyscientistshavedecidedthatoneofthemcannolongerbeconsideredaplanet.Doyouknowthenameofthatplanet?Doyouknowwhytheyremovedit?5.Whatproblemiscausedbyhumanbeings?,Closereading,1.Whywastheearthdifferentfromtheotherplanets?Becausewaterremainedontheearth.Thesignificance(意义)ofthecontinuedpresenceofwateristhatitallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.,Closereading,2.Whydidtheplantsgrowbeforetheanimalscame?Becauseplantsprovidedoxygenforanimalstobreathe.3.Whyisitwrongtoshowfilmswithdinosaursandpeopletogether?Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.,Closereading,4.Thereusedtobenineplanetsinthesolarsystem.Recentlyscientistshavedecidedthatoneofthemcannolongerbeconsideredaplanet.Doyouknowthenameofthatplanet?Doyouknowwhytheyremovedit?ThenameisPluto.Scientistsnowthinkitistoosmalltobecalledaplanet.5.Whatproblemiscausedbyhumanbeings?Humanbeingscauseglobalwarming.,Summary,Afterthe“BigBang”,theearthwasjustacloudof_dust.It_loudlywithfireandrock,whichwereintimetoproducethewater_,carbondioxideandother