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人教版高中英语必修三第四单元课件I.WarmingupI.WarmingupScientistsnowthinkPlutoistoosmalltobecalledaplanet Thenamesofeightplanets海王星 NeptuneInthisunit,we’lllearnsomethingmorescientificPanguseparatestheskyfromtheearth大家应该也有点累了,稍作休息NvwamadehumansReadthepassagequicklyandanswerthequestionsPhrasesandUsefulExpressions1.Whendidthe“BigBang”happen? Ithappenedseveralbillionyearsago.2.Whatformwastheearthafterthe“BigBang”? Theearthwasstilljustacloudofdust. 3.Whatmadeuptheearth’satmosphereaftertheearthexploded? Carbon,nitrogen,watervapourandothergases.4.Howdidwatercomeintobeingontheearth? Astheearthcooleddownafteritexploded,watercameintobeing.5.What’sthesignificanceofthepresenceofwaterontheearth? Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.6.Whatwasimportanttothedevelopmentoffish? oxygen. 7.Whatmadepossibletheriseofmammalsontheearth? Thedisappearanceofdinosaursmadethepossibletheriseofmammalsontheearth. 8.Whyaremammalsdifferentfromalllifeformsinthepast? Theygavebirthtoyoungbabyanimalsandproducedmilktofeedthem. Para.1A.Theformation(形成)oftheearth. Para.2B.Theimportanceofwaterforlife. Para.3C.Awidelyacceptedtheoryabout theformationoftheuniverse. Para.4D.Thearrivalofhumansand theirimpactontheearth. Para.5E.Thedevelopmentofplants andanimalsontheearth.True(T)orFalse(F). 1.TheearthappearedbeforetheBigBanghappened. 2.Theoriginalatmosphereconsistedofnitrogenandoxygen. 3.Themaindifferencebetweentheearthandotherplanetsisthatthereiswaterontheearth. 4.Lifebeganinwaterandthenonland.SummarySummaryPuttheorderofdevelopmentoflifeintoatimeline.Usethereadingpassagetohelpyou. 7.Theearthwasacloudofdust.() 8.Waterappearedontheearth.(1) 9.Shellfishandotherfishappeared.() 10.Theuniversebeganwitha"BigBang".() 11.Cleveranimalswithhandsandfeetappeared.(12) 12.Mammalsappeared.()discussingYoucanusethefollowingwordsorphrasestohelpyou:Homework