人教版高中英语必修三第四单元ppt课件

.,ModuleIIIUnit4Astronomy,玉树二高2014级高一十四班,.,I.Warmingup,Whatsthemeaningoftheword“Astronomy”?2.Doyouknowthefollowingterms?star（）planet（）thesun/moon/earth（）solarsystem（）3.Howmanyplanetsareinthesolarsystem?,.,I.Warmingup,Whatsthemeaningoftheword“Astronomy”?thescienceofstars;2.Doyouknowthefollowingterms?star（恒星）planet（行星）thesun/moon/earth（太阳、月亮、地球）solarsystem（太阳系）3.Howmanyplanetsarethereinthesolarsystem?8,.,ScientistsnowthinkPlutoistoosmalltobecalledaplanet,.,Thenamesofeightplanets,1)水星Mercury2)金星Venus3)地球Earth4)火星Mars5)木星Jupiter6)土星Saturn7)天王星Uranus8)海王星Neptune,.,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,.,Inthisunit,welllearnsomethingmorescientific,1.Whatsthetitleofthetext?howlifebeganontheearth2.Fromthetitle,wecanpredictthatthetextmaytellustheoriginoflifeontheearth.Doyouknowsomestoriesaboutit?,.,Panguseparatestheskyfromtheearth,.,Nvwamadehumans,.,Readthepassagequicklyandanswerthequestions,1.Whendidthe“BigBang”happen?2.Whatformwastheearthafterthe“BigBang”?3.Whatmadeuptheearthsatmosphere？4.Howdidwatercomeintobeingontheearth?5.Whatsthesignificanceofthepresenceofwaterontheearth?6.Whatwasimportanttothedevelopmentoffish?7.Whatmadepossibletheriseofmammalsontheearth?8.Whyaremammalsdifferentfromalllifeformsinthepast?,.,PhrasesandUsefulExpressions,circlearound绕转accordingto根据awidelyacceptedtheory熟知的理论inalldirections向着四面八方intime及时；终于cooldown冷却befundamentalto对关键achainaction连锁反应makeitpossiblefortodo使可能givebirthto生育11.preventfrom阻止做12.millionsofyearstocome未来的几百万年,.,1.Whendidthe“BigBang”happen?Ithappenedseveralbillionyearsago.,Scanning,Readthepassagequicklyandanswerthequestions,.,2.Whatformwastheearthafterthe“BigBang”?Theearthwasstilljustacloudofdust.3.Whatmadeuptheearthsatmosphereaftertheearthexploded?Carbon,nitrogen,watervapourandothergases.,.,4.Howdidwatercomeintobeingontheearth?Astheearthcooleddownafteritexploded,watercameintobeing.,.,5.Whatsthesignificanceofthepresenceofwaterontheearth?Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.,.,6.Whatwasimportanttothedevelopmentoffish?oxygen.7.Whatmadepossibletheriseofmammalsontheearth?Thedisappearanceofdinosaursmadethepossibletheriseofmammalsontheearth.,.,8.Whyaremammalsdifferentfromalllifeformsinthepast?Theygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.,.,Closereading,I.Readthepassagecarefullyandmatchthemainideawitheachparagraph.,.,Para.1A.Theformation(形成)oftheearth.Para.2B.Theimportanceofwaterforlife.Para.3C.Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4D.Thearrivalofhumansandtheirimpactontheearth.Para.5E.Thedevelopmentofplantsandanimalsontheearth.,.,True(T)orFalse(F).1.TheearthappearedbeforetheBigBanghappened.2.Theoriginalatmosphereconsistedofnitrogenandoxygen.3.Themaindifferencebetweentheearthandotherplanetsisthatthereiswaterontheearth.4.Lifebeganinwaterandthenonland.,F,F,T,T,.,Summary,Whatdowelearntoday?,.,Summary,Howlifebeganontheearth.,.,Puttheorderofdevelopmentoflifeintoatimeline.Usethereadingpassagetohelpyou.,1.Insectsandamphibiansappeared.(10)2.Dinosaursappeared.()3.Theearthbecameasolidball.()4.Smallplantsgrewonthewater.(8)5.Reptilesappeared.()6.Plantsbegantogrowondryland.(),.,7.Theearthwasacloudofdust.()8.Waterappearedontheearth.(1)9.Shellfishandotherfishappeared.()10.TheuniversebeganwithaBigBang.()11.Cleveranimalswithhandsandfeetappeared.(12)12.Mammalsappeared.(),.,discussing,Whatshouldwedoforourearth?,.,Youcanusethefollowingwordsorphrasestohelpy