高中英语-how life began on the earth教学课件设计

Learningaims1.Understandthedevelopmentoftheearthandthelifeonit.2.Practicethestudents’readingskills.3.RaisetheinterestofscienceandimprovetheirawarenessofprotectingtheearthUnit4Astronomy:thescienceofthestarsWeliveonthesameplanet—theearthDoyouknowtheoriginoflife

onearth?

.Reading

ReadthepassageonP25quickly,andmatchtherightmainideaofeachparagraph.Howmanypartscanthetextbedividedinto?Step1.Fastreading(skimming)HowlifebeganontheearthPara.1

Para.2Para.3Para.4Para.5AtheoryabouthowtheuniversewasformedTheformation(形成）oftheearthTheimportanceofwater

forlifeThedevelopmentofplantsandanimalsThearrivalofhumans

andtheireffectsontheearthPart1:ThedevelopmentoftheearthPart2:Thedevelopmentoflife.Howmanypartscanthepassagebedividedinto?Part1(1~3):ThedevelopmentoftheearthStep2DetailedReading(scanning)Part1(para1~3)

Thedevelopmentoftheearth(1)AftertheBigBang,whathappened?(2)Whathappenedtothesolidglobenext?(3)Whatdidthewatervapourandgasesweretomake?(4)Whatappearedaftertheearthcooleddown?(5)Whatdidthewaterdo?Howdidtheearthcomeintobeing?TheBigBangTheuniversebeganwithaBigBangalongtimeago.(1)(2)AftertheBigBang,whathappened?

acloudofdust

Settledintoasolidglobeexplodedwithfireandrock

producedwatervapourandgases(3)Whathappenedtothesolidglobe

next?Intime(4)Whatdidthewatervapourandgasesweretomake?theearth’satmosphereWaterappearedonitssurfacewhichisimportantforthebeginningoflifeontheearth.(5)Whatappearedaftertheearthcooleddown?(6)Whatdidthewaterdo?Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.Accordingtothefourpictures,trytoretellthedevelopmentoftheeath.A

cloud

of

energetic

dust

AsolidballAtmosphere

Aworldfullofwater5243CombineintoExplodewithfireandrockdissolveharmfulgases

Cooldown1BigBangPart2(4~5)ThedevelopmentoflifePart2(para4~5)

ThedevelopmentoflifeReadpara4and5carefullyandmakeatimelineofthedevelopmentoflifewater

1.2.10.3.4.insects(onland)5.6.7._________8.dinosaurs(onland)9._________11.small________inwater_________andallsortsoffishgreenplantsonland___________(onlandandinwater)forests

(onland)

(onland)smallcleveranimalswith______________plantsshellfishamphibiansreptilesmammalshandsandfeet1.atimelineofthedevelopmentoflifePuttheorderofdevelopmentoflifeintoatimeline.Step3（）Insectsandamphibiansappeared.（）Dinosaursappeared.（）Theearthbecameasolidball.（）Smallplantsgrewonthewater.（）Reptilesappeared.（）Greenplantsbegantogrowondryland.（）Theearthwasacloudofdust.（）Waterappearedontheearth.（）Shellfishandotherfishappeared.（）Theuniversebeganwitha“BigBang”.（）Cleveranimalswithhandsandfeetappeared.（）Mammalsappeared.51062948371

Puttheorderofdevelopmentoflifeintoatimeline.12

11

Step3Step4SummaryMainidea:Thetextmainlytellsus______________________________________________________thedevelopmentoftheearthandthelifeonit.Step5DiscussionWhatproblemiscausedbyhumanbeing?globalwarmingAsastudent,whatlittlethingscanwedofortheearth?DiscussionSuggestedanswers:Theearthwillbesohotthatnolifewillexist（存在）ontheearthanymore.Tosolvethisproblem,peopleshouldprotecttheearthcarefully.

Firstofall,weshouldplantmoretreestopurifytheair.Besides,reducethepollutionandcontrolthepopulationalsomakeadifference.What’smore,actionshouldbetakentostopputtingtoomuchcarbondioxideintotheair.Lastbutnotleast,improvepeople'sawarenessofenvironmentalprotectionisanimportantfactor.

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