高中英语必修三unit4 reading(公开课)

thescienceofthestarsUnit4AstronomyContentsWarmingupPre-readingReadingSumupConsolidationHomeworkPre-readingWarmingup1.Whoareourancestors?2.Doyouknowhowlifebeginsontheearth?Let’sbrainstormthefollowingquestionsLet’senjoyavideofirst.Trytoputtherightorderofdevelopmentoflifeontheearth???Ifyouwanttoknowmore,pleaseturntoPage25①②③④⑥⑦⑤Lookattitleandthepictures.Canyougetsomeinformationaboutwhatwewilllearnfromthetext?Bigbang???Theevolutionoflifeontheearth???Thetextmaytellusthe___________oftheearthandthe___________oflifeonit.HowlifebeginontheearthPre-readingPre-readingFastreadingAnswerthefollowingquestions.1.Howmanyparagraphsarethereinthetext?2.WhatisthewidelyacceptedtheoryinPara1?3.Whywaslifeabletodevelopontheearthbutnotonotherplanets?A.theearthhadasolidshape.B.theearthdidn’thaveharmfulgases.C.thewaterstayedontheearthbutnotonotherplanets.4.Canyousumupthemainideasofeachparagraph?Firstly,youcanfindthekeywordsofeachparagraphTip:Para.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.CarefulreadingTaskoneReadthetextagain,tellmehowtheauthororganizesthetext?AccordingtotimeOk,pleasequicklyfindthetimefromthetext.Ok,nextwewillreadthetextaccordingtotimeSeveralbillionyearsafterthe“bigbang”between4.5and3.8billionyearsagoManymillionsofyearslaterAbout2.6millionyearsagoTimelinePara2Severalbillionyearsafterthe“bigbang”between4.5and3.8billionyearsagoTheearthwasstilljust_____________.Thenthedustsettledintoa___________.Thentheearthbecameso________andexplodetoproduceits___________.solidglobeviolentatmosphereTasktwoacloudofdustPara4ManymillionsofyearslaterThefirstsmallplantsonthesurfaceofthewaterproduced_______.Early_______andallsortsoffishappeared.__________begantogrowonland.followedby_________,someare_______.others,called_________oxygenshellfishgreenplantslandanimalsinsectsamphibiansManymillionsofyearslaterWhentheplantsgrewintoforests,_______appeared.Afterthat,some_____________,calleddinosaursdeveloped.Thedisappearanceofdinosaursmadepossibletheriseof_______ontheearth.reptileshugeanimalsmammalsAbout2.6millionyearsagoNowHumansproducetoomuchcarbondioxide,makingtheearthtoohottolivein.Para5Afterthecleveranimals(humans)becameimportantontheearth,whathappened?Answerquestion1234567Let’scheckwhetherweputtherightorderatfirst.Areyouright?①②③④⑤⑥⑦TaskthreePleasereadthetextagain,thenputtheorderofthesesentences.(exercise2,page27)□Insectsandamphibiansappeared□Theearthbecameasolidball□Reptilesappeared.□Theearthwasacloudofdust.□Shellfishandotherfishappeared.□Cleveranimalswithhandsandfeetappeared.□Dinosaursappeared.□Smallplantsgrewonthewater.□Plantsbegantogrewontheearth.□Waterappearedontheearth.□Theuniversebeginwitha“bigbang”□Mammalsappeared.BigBang4.5-3.8billionmanymillionyearslater2.6millionNow⊕⊕⊕●●●●●●●●★TimeEventsBigBangdustsolidglobewaterappearssmallplantsshellfishandfishplantsgrowonthelandinsectsandamphibiansreptilesdinosaurmammalscleveranimalshumanslifeearthSumupThetextmaytellusthe___________oftheearthandafter________appear,the___________oflifeoneafteranotheronit.formationwaterdevelopmentConsolidationTaskoneLet’slistentotherecordingofPara5,andthenreadingitloudly.Youshouldpayattentiontothepronunciation,intonationandtone.Inthelastparagraph,weknowhumansfaceseriouslyglobalwarmingproblem,whichisthreateningourexistence.Canyouwritesomethingtocallonustoprotectourenvironment?TasktwoTheearthweliveinisbecomingmoreandmoreterrible,sowemusttakemeasurestodealwithitFirstly:Secondly:Thirdly:Wehopetheenvironmentwillbecomemoreandmorebeautiful.SampleTheearthweliveinisbecomingmoreandmoreterrible,sowemusttakemeasurestodealwithitFirstly,thegovernmentshouldpasslawstopreventpeopleandfactoriesfrompollutingtheenvironment.Secondly,everyoneshouldrealizetheimportanceoftheproblemandtrytheirbesttoprotecttheenvironmentandfightagainstpollution.Besides,it’sagoodideastoplanttreestoimprovetheenvironment.Wehopeourearthwillbecomemoreandmorebeautiful.例文1.Learnthenewwordsbyheart2.Listentotherecordingofthetext,andparaphrasethedifficultsentencesinthetext.Homework