最新高中英语必修三第四单元课件 30页

Unit4Astronomy:thescienceofthestars高中英语必修三第四单元课件\nHowmuchdoyouknowabouttheuniverse?Whatarethenamesoftheeightplanetsthatcircleoursun?Whatistheirorderfromthesun?高中英语必修三第四单元课件\n高中英语必修三第四单元课件\n地球______木星______火星______水星________海王星_______土星________天王星_______金星________EarthJupiterMarsMercuryNeptuneSaturnUranusVenusTHESOLARSYSTEM高中英语必修三第四单元课件\n1.Howoldistheuniverse?2.Howoldistheearth?3.Whichwerethefirstcreatureorplantsonearth?4.Doyouknowwhattheorderforthedevelopmentofplantsandanimalsis?Severalbillionyearsago.Between4.5and3.8billionyearsago.Verysmallair-breathingcreatures.FreeTalk高中英语必修三第四单元课件\nIdeasabouthowlifebegan高中英语必修三第四单元课件\nreadingHowLifeBeganontheEarth高中英语必修三第四单元课件\nFastreadingReadthepassagequicklyandfindthemainidea.Abriefintroductiononhowtheuniversedevelopedandhowlifebeganontheearth.高中英语必修三第四单元课件\nCarefulreadingPara1:Para2:Para3:Para4:Para5:Awidelyacceptedtheoryabouttheformationoftheuniverse.Theformationoftheearth.Theimportanceofwaterforlife.Thedevelopmentofplantsandanimalsontheearth.Thearrivalofhumansandtheirimpactontheearth.Readthepassagecarefullyandanalyseitsstructure.earth,atmosphereandwaterlifedevelopmenthumanbeings高中英语必修三第四单元课件\n1.Whatistheoriginalearth’satmospheremadeupof?2.Whydidscientistsbelievewaterisfundamentaltothedevelopmentoflife?3.Howdidwatercomeintobeingontheearth?4.Whichkindoflife-beingfirstappearedontheearth,plantsoranimals?Why?5.Whyweremammalsdifferentfromalllifeformsinthepast?Answerthefollowingquestions.高中英语必修三第四单元课件\nCarbon,nitrogen,watervapour,andothergases.2.Whydidscientistbelievewaterisfundamentaltothedevelopmentoflife?Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseastoensureafollowingchainreaction,whichmadeitpossibleforlifetodevelop.Whatistheoriginalearth’satmospheremadeupof?3.Howdidwatercomeintobeingontheearth?Theexplosionoftheearthproducedwatervapor,whichturnedintowaterwhentheearthcooleddown.高中英语必修三第四单元课件\n4.Whichkindoflife-beingfirstappearedontheearth,plantsoranimals?Why?Atfirst,smallplantsbegantoappearonthesurfaceofthewater,theyproduceoxygen,whichencouragedthelaterdevelopmentofearlyshellfishandallsortsoffish.5.Whyweremammalsdifferentfromalllifeformsinthepast?Theyweredifferentbecausetheyproducedtheiryoungfromwithintheirbodiesandproducemilktofeedthem.高中英语必修三第四单元课件\n（）1Insectsandamphibiansappeared.（）2Dinosaursappeared.（）3Theearthbecameasolidball.（）4Smallplantsgrewonthewater.（）5Reptilesappeared.（）6Plantsbegantogrowondryland.（）7Theearthwasacloudofdust.（）8Waterappearedontheearth.（9Shellfishandotherfishappeared.（）10Theuniversebeganwitha“BigBang”.（）11Cleveranimalswithhandsandfeetappeared.（）12Mammalsappeared.875）64110392Puttheorderofdevelopmentoflife.1211高中英语必修三第四单元课件\nLetreviewtheevolutionoflifeontheearth.高中英语必修三第四单元课件\nAfterthe“BigBang”,theearthwasfullofwater.高中英语必修三第四单元课件\nOriginalcellsappearedintheocean.高中英语必修三第四单元课件\nThecellsinthewaterbegantoseparate.Smallplantscameintobeing.高中英语必修三第四单元课件\nEarlyshellfishandallsortsoffish高中英语必修三第四单元课件\nSomeanimals(amphibian&insects)cametoland.高中英语必修三第四单元课件\nReptileappeared.高中英语必修三第四单元课件\ndinosaurs高中英语必修三第四单元课件\nmammals高中英语必修三第四单元课件\nManhadevolvedfromapes.高中英语必修三第四单元课件\nWearemakingtheworldbetter.Wearemakingtheworldworse.Discussion高中英语必修三第四单元课件\nBecausetheyareputtingtoomuchcarbondioxideintotheatmosphere.Theearthmaybecometoohottoliveon.高中英语必修三第四单元课件\nTheearthisbecominghotterandhotter!高中英语必修三第四单元课件\nsolarenergyplanttreesrecyclerubbishpreventdesertificationsavewaterpurifyairWhatcanwedototakecareoftheearth?高中英语必修三第四单元课件\nWhetherlifewillcontinueontheearthdependsonhumanbeings.高中英语必修三第四单元课件\n精讲点拨Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceans.分析句子：高中英语必修三第四单元课件\nHomework1.AcompositionaboutWhatwecandototakecareoftheearth?2.Readandretellthepassagetolearntheimportantanddifficultlanguagepoints.高中英语必修三第四单元课件