人教版高中英语必修三unit4全课件

Unit4Words1.intime:soonerorlater;eventually迟早；最后；终于intime(forsth/todosth):notlate及时；不迟Shewillbebackintimetopreparedinner.她来得及回来准备晚饭。I’llseehimintime.总有一天我会遇见他。in/outoftime:in/notinthecorrecttime合/不合节拍Theaudienceclappedintimetothemusic.观众合着音乐的节拍拍手。beharmfulto对…有害doharmtosb.=dosb.harm伤害某人，对某人有害处1)Pollutionisespeciallyharmfultoanimals.2)Smokingwilldoyoualotofharm.Itdoesnoharm(forsb.)todo…Itdoesnoharnforyoutoopenthewindow.Thereisnoharmin(sb.’s)doingsth.Thereisnoharmin(your)openingthewindow.2.3.multiply(数目上)增加，增多；乘；（使）繁殖1)Ourproblemshavemultipliedsincelastyear.2)2and5multiplytomake10.4)Theplantsheremultiplyrapidly.3)6multipliedby5is30.=Multiply6by5tomake30.•4.preventsbfrom(doing)sth=stopsbfromdoingsth阻止...做...”在主动语态中from可以省略，被动语态中不行。•Howtoprevent/stopthis(from)happening.•Itsnationalsmaybeprevented/stoppedfromleavingthecountry.•keepsbfromdoingsth中的from无论在主动语态中还是在被动语态中都不能省略。“阻止...做...”,如果省略from,意思为让某人一直做某事•Hekeptmefromgettinghurt.•Hekeptmedoinghomework.•5.puzzlen.谜；难题v.（使）迷惑；（使）为难•It'spuzzlesme.•feel/bepuzzledaboutsth.对某事感到迷惑•puzzleover/aboutsth.对某事苦苦思索•�这个字母使我迷惑不解。Thisletterpuzzlesme.•‚她对她的未来感到迷惑。Shefeltpuzzledaboutherfuture.•ƒ他昨晚冥思苦想一道数学题。Hepuzzledover/aboutamathproblemlastnight.•puzzlingadj.使迷惑的puzzledadj.迷惑的；困惑的•6.breakoutvt.&vi.（战争、打斗等不愉快事件）突然发生，爆发;突然发生，爆发;向外砸开;也可以表示突然大声叫喊等。•Thewarbrokeoutin1937.•Afirebreakoutlastnight.•Shebrokeout,“Thatistoounfair!”•takeplace表示“发生、举行、举办”，一般指非偶然性事件的“发生”，即这种事件的发生一定有某种原因或事先的安排。例如：•TheOlympicGamesof2008tookplaceinBeijing.•happen作“发生、碰巧”解，常指具体事件的发生，特别指那些偶然的或未能预见的“发生”，一般用于偶然或突发性事件。例如：•Astormhappenedacrosstheriverinanothercountry.•occur作“发生、想到、突然想起”解，其意义相当于happen。例如：•Whathasoccurred?(=Whathashappened?)•comeabout表示“发生、产生”，多指事情已经发生了，但还不知道为什么，常用于疑问句和否定句。例如：•WhenMotherwokeup,shedidn'tknowwhathadcomeabout.1.What’sthemeaningoftheword“Astronomy”?I.Warmingup行星thescienceofstars;2.Doyouknowthefollowingterms?star,planet,thesun/moon/earth,solarsystem太阳系3.Howmanyplanetsareinthesolarsystem?恒星ScientistsnowthinkPlutoistoosmalltobecalledaplanet.4.Doyouknowthecorrectorderoftheirdistancetothesun?nearesttothesun?farthesttothesun?5.Thenamesofeightplanets.•Mercury[ˈmɜ:kjəri]•Venus•Earth•Mars•Jupiter[ˈdʒu:pɪtə]•Saturn[ˈsætən]•Uranus[ˈjʊərənəs]•Neptune[ˈnepˌtu:n,-ˌtju:n]1)水星2)金星3)地球4)火星5)木星6)土星7)天王星8)海王星Inthisunit,we’lllearnsomethingmorescientific.1.What’sthetitleofthetext?2.Fromthetitle,wecanpredictthatthetextmaytellustheoriginoflifeontheearth.Doyouknowsomestoriesaboutit?Panguseparatestheskyfromtheearth.Nvwamadehumans.1.Whendidthe“BigBang”happen?Readthepassagequicklyandanswerthequestions.2.Whatformwastheearthafterthe“BigBang”?3.Whatmadeuptheearth’satmosphere4.Howdidwatercomeintobeingontheearth?5.What’sthesignificanceofthepresenceofwaterontheearth?6.Whatwasimportanttothedevelopmentoffish?7.Whatmadepossibletheriseofmammalsontheearth?8.Whyaremammalsdifferentfromalllifeformsinthepast?1.Whendidthe“BigBang”happen?Ithappenedseveralbillionyearsago.ScanningReadthepassagequicklyandanswerthequestions.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.ClosereadingI.Readthepassagecarefullyandmatchthemainideawitheachparagraph.Para.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.DetailedreadingStage1:ThedevelopmentoftheearthStage2:Thedevelopmentoflife(para1—3)(para4—5)Stage1:Thedevelopmentoftheearth(1)AftertheBigBang,whatwastheearthlike?acloudofdustasolidglobeexplodedwithfireandrockproducedwatervapourandgases(2)Whathappenednext?(3)Whatdidthewatervapourandgasesform?theearth’satmosphereWaterappeared(4)Whatappearedastheearthcooleddown?waterisimportantforthebeginningoflifeontheearth.Whyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesintooceansandseas.Stage2Thedevelopmentoflifesmallplantsappearsinwater1.Whatlifedevelopedafterwaterappeared?Shellfishandallsortsoffish2.Whatlifedevelopedinwaternext?greenplantsbegantogrowonlandinsectsappeared3.Whataboutthelifeonland?amphibiansonlandandinthewaterforests4.Whatlifedevelopednextonland?reptilesappeareddinosaurdeveloped5.Whatlifedevelopedafterforestsappeared?mammalsonland6.Whatlifedevelopedafterdinosaurs?smallcleveranimals7.Whatlifedevelopedaftermammals?1.Whoarethesmallcleveranimalswithhandsandfeet?2.Aretheytakingcareoftheearthwell?Why?Becausetheyareputtingtoomuchcarbondioxideintotheatmosp