人教新课标高中英语必修三Unit4_Astronomy_全单元课件

WELCOMETOMYENGLISHWORLD!---Unit4Astronomy:thescienceofthestarsWhatsubjectsdoyouhavetoday?EnglishmathematicschemistryChinesepoliticsStep1WarmingupWhatothersubjectsdoyoulearnatschool?physicsGeographyPEBiologyartHistorymusicphysicsmathematicschemistrybiologySciencesubjectsmedicinebiologychemistryastronomyphysicsmathematicsAstronomyisthescientificstudyoftheuniverseandtheheavenbodies(suchasthesun,themoon,andstars),gas,anddustwithinit.astronomerTheBigBangTheSolarsystem•eightplanets•manycomets•otherobjectsReadingHowLifeBeganontheEarthStep2While-readingReadpassageandmatchthemainideaforeachparagraph.Task1readandmatchMainideaofeachparagrapha.Theimportanceofwaterforlifeb.Thedevelopmentofplantsandanimalsontheearthc.Theformationoftheearthd.Awidelyacceptedtheoryabouttheformationoftheuniversedcabe.ThearrivalofhumansandtheirimpactontheearthParagraph5:Paragraph1:Paragraph2:Paragraph3:Paragraph4:eWhile-readingWorkinpairs.PuttheorderofDevelopmentoflifeintoatimelineaccordingtothereadingpassage.Puttheorderofdevelopmentoflifeintoatimeline.A.Insectsandamphibiansappeared.B.Theearthbecameasolidball.C.Reptilesappeared.D.Theearthwasacloudofdust.E.ShellfishandotherfishappearedF.Dinosaursappeared.G.Smallplantsgrewonthewater.H.Plantsbegantogrowondryland.I.Waterappearedontheearth.J.Mammals(includinghumans)appeared.DBIGEHACFJWhile-readingThinkaboutwhatyouhavereadandmakechoices.Whywastheearthdifferentfromotherplanets?AItproducedalotofheat.B.Thewaterremained.CWaterdisappeared.D.Itwastheoldestplanet.ks5u精品课件Whywaslifeabletodevelopontheearthbutnotonotherplanets?ATheearthhadasolidshape.B.Theearthdidnothaveharmfulgasesinitsatmosphere.CThewaterstayedontheearthbutnotonotherplanets.D.Theearthwasnottoohotandnottoocold.ks5u精品课件Whydidtheplantsgrowbeforeanimalscame?AAnimalsneededplantstoprotectthemfromthesun.BPlantsprovidedoxygenforanimalstobreathe.CAnimalscouldhidefromhuntersinforest.DItwaseasierforplantstogrow.ks5u精品课件Whatproblemiscausedbyhumanbeings?ATheyexisteverywhereontheearth.BTheycauseglobalwarming.CTheyfindnewmethodsofgrowingcrops.DTheyenjoyhuntingandfishing.ks5u精品课件Asastudent,whatlittlethingscanwedofortheearth?topreventtheearthfromgettinghotterandhottertoslowdowntheproblemgettingworse……Step3DiscussionWehaveonlyoneearth!Weshouldtakecareoftheearth!ks5u精品课件Whetherlifewillcontinueontheearthdependsonhumanbeings.Step4Homework1.Readaloudthereadingpassageandretellthepassaage2.FinishoffEx1andEx2onP.28.TextRetellingTheexplosionoftheearthproduced___________,whichturnedintowaterwhentheearthcooleddown.Waterallowedtheearthto_________harmfulgasesintotheoceansandseas.Thatmadeitpossiblefor_____tobegintodevelop.Thearrivalofsmall_____encouragedthedevelopmentofearly_______andallsortsoffish.Manymillionsofyearslaterthefirstgreenplantsbegantoappearonland.watervapourdissolvelifeplantsshellfishLaterlandanimalsappeared.Somewere_______.Others,called_________,wereabletoliveonlandaswellasinthesea.Whentheplantsgrewintoforests,__________appearedforthefirsttime.Then________developed,whichbecamethemostimportantanimalsontheearthformillionsofyears.Aftertheydisappeared,________becamemoreimportant.TextRetellinginsectsamphibiansreptilesdinosaursmammalsTheywerethelastgroupofanimalsandtheyweredifferentbecausethey______theiryoungfromwithintheirbodies.Smallcleveranimals,withhandsandfeet,________and_______allovertheearth.Astimewentby,theycoveredtheearthandhavebecomethemostimportantanimalsontheplanet.TextRetellingproducedappearedspread