人教版高中英语必修三Unit 4 How life began on the earth课件

Unit4HowlifebeganontheearthReadingWarmingup Lookatthepicturesanddiscusshowlifebeganontheearth.1.Panguseparatedtheskyfromtheearth2.Nvwacreatedhumans.3.Godcreatedtheworld.Discuss Aretheyscientificideasorreligiousideas?Lookatthetitleofthetextandguessthemainideaofthepassage. Itismainlyabouthowlifecameintobeingontheearth.Skimming:Readthetextquicklyandfillinthefollowingchart. Mainideaofthepassage Theappearanceanddevelopmentoflifeontheearth Mainideaofparagraph1 Mainideaofparagraph2 Mainideaofparagraph3 Mainideaofparagraph4 Mainideaofparagraph5TheformationoftheearthAwidelyacceptedtheoryabouttheformation(形成，产生)oftheuniverseTheimportanceofwaterforlifeThedevelopmentofplantsandanimalsontheearthTheappearanceofhumansandtheirimpactontheearth Mainideaofthetext Theappearanceanddevelopmentoflifeontheearth Mainideaofparagraph1 Mainideaofparagraph2 Mainideaofparagraph3 Mainideaofparagraph4 Mainideaofparagraph5Intensivereading：Putthefollowingstatementsintheorderoftime. 1.Waterwasfirstfoundontheearth. 2.Theearthwasacloudofdust. 3.Shellfishandotherfishcameintoexistence. 4.Cleveranimalswithhandsandfeetappeared. 5.Plantsbegantogrowondryland. 6.Therewerefirstinsectsandamphibians. 7.Dinosaursappeared. 2-1–3-5-6-7-4Decidethefollowingstatementstrueorfalseaccordingtothetext.（）1.Weallknowexactlyhowtheworldcameintobeing.（）2.Attheverybeginningtheearthwasveryviolentsothatitwasunclearwhethertheshapewouldlastornot.（）3.Thecontinuedpresenceofwaterontheearthmadeitpossiblethatlifeslowlydevelopedontheearth.（）4.Dinasaursexistedontheearthandtheywerethefirstmammals.（）5.Lifeissuretocontinueontheearthinthefuture.()1.Weallknowexactlyhowtheworldcameintobeing.()2.Attheverybeginningtheearthwasveryviolentsothatitwasunclearwhethertheshapewouldlastornot.FT()3.Thecontinuedpresenceofwaterontheearthmadeitpossiblethatlifeslowlydevelopedontheearth.()4.Dinasaursexistedontheearthandtheywerethefirstmammals.TF()5.Lifeissuretocontinueontheearthinthefuture.FTranslatethedifficultsentences.Meanwhilepaymoreattentiontotheunderlinedparts.1.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.2.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonthesurface.3.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospare.1.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.该句中的whatitwastobecome是一个____从句，在整个句子中做主语，betodo这一结构在本句中示过去将来。whenthedustsettledintoasolidglobe是一个___从句。主语定语2.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonthesurface.该句中的Whatisevenmoreimportant是一个______从句，在整个句子中做主语。thatastheearthcooleddown,waterbegantoappearonthesurface是一个____从句，在这一从句中又含有一个as引导的______状语从句。主语表语时间3.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospare.该句中的whichpreventsheatfromescapingfromtheearthintospare是一个______从句，在整个句子中做定语，其中which指代______________________________________________________这个句子。定语TheyareputtingtoomuchcarbondioxideintotheatmosphereRetellthetextusingtheproperwords.__________(1根据)awidelyacceptedtheory,theuniverse__________(2从…开始)a“BigBang”.Forseveralmillionyearsafterthat,theearthwasstill_____________(3一团尘埃).Thedustcombinedintoaball,_____(4move)aroundthesun.Theearthbecameviolentanditexplodedloudly.Astheearth__________(5冷却),waterbegantoappearonitssurface.Thecontinuedpresenceofwatermade_____(6)possibleforlifetodevelop.AccordingtobeganwithacloudofdustmovingcooleddownitFirstofall,smallplantsbeganto________(7出现)onthesurfaceofthewater.Thereappearedshellfishandallsortsoffishinthewater.Latergreenplantsbegantogrow________(8在陆地上).Whentheygrewintoforests,reptilesappearedandtheyproducedyounggenerallyby________(9产卵)Thedisappearanceofdinosaurs___________(10还是一个谜)butitmadeitpossibleforthemammalstodevelopontheearth.Amongthemammalsthemostimportantanimalshumanbeingsproduced________(11太多)carbondioxide,whichpollutestheairandpreventsheatfromescapingfromtheearthintospace.Asaresult,thereissomedoubt________(12)lifewillcontinueontheearthformillionsofyearstocome.7appear8onland9layingeggs10remainsamystery11toomuch12whetherPicturesaboutwhatpeopledidtotheearthDiscussion:Whatshouldwedotopreventourselvesfrombeingdyingout?Thankyouverymuch!