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

Unit42015-4-1Astronomy:thescienceofthestarsEarthHowlifebeganontheearthPanguseparatestheskyfromtheearth.Nvwamakeshumanbeings.Inthewesternculture,theGodcreateseverythingintheworld?

HOWLIFEBEGANONTHEEARTH

ReadingScanning:

Task1:Matchtheparaswiththeirmainideas

Para1(1)Thearrivalofhumansandtheirinfluenceontheearth.Para2(2)Theimportanceofwaterforlife.Para3(3)Theformationoftheearth.Para4(4)Awidelyacceptedtheoryabouttheformationoftheuniverse.Para5(5)Thedevelopmentofplantsandanimalsontheearth.Task2:Puttheorderofdevelopmentoflifeintoatimeline.Insectsandamphibiansappeared.Theearthbecameasolidball.Reptilesappeared.Theearthwasacloudofdust.ShellfishandotherfishappearedDinosaursappeared.Smallplantsgrewonthewater.Plantsbegantogrowondryland.Waterappearedontheearth.Mammalsappeared.DBIGEHACFJWhywastheearthdifferentfromotherplanets?AItproducedalotofheat.B.Thewaterremained.CWaterdisappeared.D.Itwastheoldestplanet.Whywaslifeabletodevelopontheearthbutnotonotherplanets?ATheearthhadasolidshape.B.Theearthdidnothaveharmfulgasesinitsatmosphere.CThewaterstayedontheearthbutnotonotherplanets.D.Theearthwasnottoohotandnottoocold.精品课件Task1:MakechoicesWhydidtheplantsgrowbeforeanimalscame?AAnimalsneededplantstoprotectthemfromthesun.BPlantsprovidedoxygenforanimalstobreathe.CAnimalscouldhidefromhuntersinforest.DItwaseasierforplantstogrow.Whatproblemiscausedbyhumanbeings?ATheyexisteverywhereontheearth.BTheycauseglobalwarming.CTheyfindnewmethodsofgrowingcrops.DTheyenjoyhuntingandfishing.精品课件DevelopmentoftheearthTheuniversebeganwitha“________”.Afterthe“BigBang”,theearthwasjustacloudof_______.Between4.5and3.8billionyearsago,thedustsettledIntoa________.

Itexplodedloudlyandproducedtheearth’s_________Whentheearthcooleddown,______appearedonitssurface.ConsolidationBigBangdustsolidglobeatmospherewater1.

Afterwaterappeared,___________appearedonthesurfaceofthewater,whichencouragedthedevelopmentof____________________smallplantsshellfishandallsortsoffishDevelopmentoflife2.Next,___________begantogrowonlandaswellaslandanimals-------_____and__________,whichcanlivebothonlandandinthewater.greenplantsamphibiansinsectsDevelopmentoflife3.Later,whenplantsgrewintoforests,______appearedforthefirsttime.

Somehugeanimals,called_________,developed,theyproducedyoungbylayingeggs.reptilesdinosaursDevelopmentoflife4.About65millionyearsago,dinosaursdisappeared,afterthat,_________becamemoreimportant.mammalsDevelopmentoflife5.Nowhumanbeingshavebecomethemost___________________ontheplanet.Buttheyarenot_____________theearthverywell.Scientistsbelievetheearthmaybecometoohotto___________.Willthisproblembesolved?importantanimalslookingafterliveonDevelopmentoflifeAsastudent,whatcanwedofortheearth?Group-work:discussion

solarenergy

planttrees

recyclerubbishsavewater

purifyairWhatcanwedototakecareoftheearth?Wehaveonlyoneearth!Weshouldtakecareoftheearth!精品课件2.Whatitwastobecome

wasamysteryuntilthedustbegantoslowlycombineintoaballmovingaroundthesun.1.Nooneknowsexactlyhowtheearthbegan,asithappenedsolongago.3.Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.Nounclauses6.Whatmanyscientistbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.

4.Whatisevenmoreimportantisthat

astheearthcooleddown,

waterbegantoappearonit’ssurface.5.Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.Nounclauses7.Whytheysuddenlydisappearedstillremainsamystery.8.Asaresultofthis,manyscientistsbelievetheearthmaybecometoohottoliveon.9.Whetherlife