unit3-how-life-began-on-the-earth.ppt(reading)

Step1WarmingupWhatarethenamesoftheeightplanetsthatcircleoursun?海王星Saturn水星Uranus金星Venus地球Earth火星Mars木星Mercury土星Jupiter天王星NeptuneAQuizGame1.Howoldistheearth?A.About3.5billionyearsB.About4.5billionyearsC.About5.5billionyearsD.About6.5billionyears2.______oftheearthsurfaceiscoveredbywater.A.20%B.30%C.50%D.70%3.HowmanyplanetsarethereintheSolarSystem?A.6B.7C.8D.94.Whatisthetotalpopulationofhumansontheearth?A.About3.5billionB.About4.5billionC.About5.5billionD.About6.5billion5.Howlongdoestherotation(自转)oftheearthtake?A.12hoursB.24hoursC.amonthD.365days6.Whichcontinentisthesmallest?A.AfricaB.NorthAmericaC.SouthAmericaD.Oceania7.OnwhatdayistheEarthdaycelebrated?A.April22B.May4C.August21D.November118.Whichoceanisthelargest?A.ThePacificOceanB.TheArcticOceanC.TheIndianOceanD.TheAtlanticOcean9.Whichcountryhasthelargestarea?A.CanadaB.ChinaC.RussiaD.U.S.AStep2Pre-reading1.Howdidtheuniversebegin?2.Howdidlifebeginontheearth?Therearedifferentlegends(传说)ofhowtheuniverseandlifebeganindifferentcultures:InChineseculture…Panguseparatestheskyfromtheearth.中国神话传说中有盘古开天地的说法。巨人盘古用一把利斧劈开混沌,将天地分开。死后,他的气息化成风和云,声音变成轰轰的雷声,左眼化为太阳,右眼化为月亮,手足与四肢变成大地的四极与五方的名山,血液化成江河,筋脉铺成道路,肌肉形成田地,须发成为星星,牙齿和骨骼化为金属、珍珠、玉石,汗水成为滋润万物生长的甘霖和雨露。Nvwamadehumans.Inwesternculture:GodcreatedtheworldinsevendaysDoyouknowwhatascientificideais?1.TheuniversebeganfromtheBigBang.2.Lifefirstbeganintheseaontheearth.3.LifewasbroughttotheearthbyETfromouterspace.What’sthewritingstyleofthetext?A.Narrative记叙文B.Explanation说明文C.Essay散文11111111111111111111111111111111111111111111111111111111•1.What’sthemainideaofthetext?•2.Howmanypartscanthetextbedividedinto?What’sthemainideaforeachpart?Step3:ReadingFast-readingPara.1Para.2Para.3Para.4Para.5A________abouthowtheuniversewasformedThe__________oftheearthTheimportanceof______forlifeThe_______________ofplantsandanimalsThearrivalof_________andtheireffectsontheearththeoryformationwaterdevelopmenthumansHowlifebeganontheearthLet’sgettoknowhowlifebeganontheearthTasktwo:Readparagraph1--3quicklybyyourselves.Afterthe“BigBang”,whathappenedontheearth?1.Whoknowshowlifebeganontheearthexactly?A.Scientists.B.Astronomers.C.Noone.D.Aliens(外星人).2.Whywastheearthdifferentfromotherplanets?A.Itproducedalotofheat.B.Thewaterremained.C.Waterdisappeared.D.Itwastheoldestplanet.3.Whywaslifeabletodevelopontheearthbutnotonotherplanets?A.Theearthhadasolidshape.B.Theearthdidnothaveharmfulgasesinitsatmosphere.C.Thewaterstayedontheearthbutnotonotherplanets.D.Theearthwasnottoohotandnottoocold.Stage1:Thedevelopmentoftheearth(1)AftertheBigBang,whathappened?acloudofdustaviolentsolidballexplodedwithfireandrockProducedcarbon,nitrogen,watervaporandgases(2)Whathappenednext?(3)Whatdidwatervapourandgasesmake?theearth’satmosphereWaterappearedwhichisimportantforthebeginningoflifeontheearth.(4)Whatappearedontheearththen?(5)Whatdidthewaterform?oceansandseasretellhowtheearthandwatercomeaboutBigBangAcloudofdustAsolidglobeExplodedloudlywithfireandrockcarbon,nitrogen,watervaporandothergasestheearth’satmosphereTheearthcooleddownWaterappearedReadparagraph4and5quickly,andfindouttheorderofdevelopmentoflifeontheeartharrivalofsmallplantsinwaterWhatlifedevelopedafterwaterappeared?earlyshellfishandallsortsoffishStage2:ThedevelopmentoflifeinwaterStage3:Thedevelopmentoflifeonland.greenplantsonlandinsectsonlandamphibiansonlandandinthewater(1)Whatlifedevelopedafterthelifeinwater?reptilesonlanddinosaursonland(2)Whatlifedevelopedafterforestsappeared?Howdoreptilesproduceyoung?bylayingeggsmammalsonland(3)Whatlifedevelopedafterdinosaurs?Howdomammalsproduceyoung?bygivingbirthtobabyanimalsandproducingmilktofeedthem.humanscameintobeingStage4:ThedevelopmentofhumansWhatlifedevelopedaftermammals?Theydevelopednewmethodsofgrowingfood,hunting,andmovingaround.1.Whatdidhumansdevelop?Theyareputtingtoomuchcarbondioxideintotheatmosphere.2.Whatproblemarehumanscausing?Step4Comprehending1.Whywastheearthdifferentfromotherplanets?2.Whywaslifeabletodevelopontheearthbutnotonotherplanets?3.Whywasitnecessaryforplantstogrowbeforeanimals?4.Whatproblemiscausedbyhumanbeings?Thewaterremained.Theearthdidnothaveharmfulgasesinitsatmosphere.Plantsprovidedoxygenforanimalstobreathe.Theycauseglobalwarming.Accordingtothepictures,haveatrytoretellthedevelopmentoflife.Puttheorderofdevelopmentoflifeintoatimeline.A.insectsandamphibiansappearB.asolidballC.reptilesappearD.acloudofdustE.shellfishandotherfishappearF.dinosaursappearG.smallplantsgrowonthewaterH.plantsbegintogrowondrylandI.presenceofwaterJ.mammals(includinghumans)appearDBIGEHACFJDiscussionWhyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether?Dinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.Howlifebeganontheearth“BigBang”otherbodies________starsEarth:acloudof_____atomsdustSummaryasolid_____theearth’s_____________other4._____Water:____________tothedevelopmentoflifewatervapournitrogencarbonextremelysmall_______onthesurfaceofthewaterglobegasesatmospherefundamentalplantsearly_________andallsortsoffishgreenplantsonlandlandanimalsinsectsamphibians___________hugeanimals(dinosaurs)therise