高中英语必修三unit4-reading(公开课).ppt

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1、thescienceofthestarsUnit4AstronomyContentsWarmingupPre-readingReadingSumupConsolidationHomeworkPre-readingWarmingupWhoareourancestors?2.Doyouknowhowlifebeginsontheearth?Let’sbrainstormthefollowingquestionsLet’senjoyavideofirst.Trytoputtherightorderofdevelopmentoflifeontheearth???Ifyouwanttokn

2、owmore,pleaseturntoPage25①②③④⑥⑦⑤Lookattitleandthepictures.Canyougetsomeinformationaboutwhatwewilllearnfromthetext?Bigbang???Theevolutionoflifeontheearth???Thetextmaytellusthe___________oftheearthandthe___________oflifeonit.HowlifebeginontheearthPre-readingPre-readingHowlifebeganontheEarthFast

3、readingAnswerthefollowingquestions.Howmanyparagraphsarethereinthetext?WhatisthewidelyacceptedtheoryinPara1?Whywaslifeabletodevelopontheearthbutnotonotherplanets?A.theearthhadasolidshape.B.theearthdidn’thaveharmfulgases.C.thewaterstayedontheearthbutnotonotherplanets.4.Canyousumupthemainideasof

4、eachparagraph?Firstly,youcanfindthekeywordsofeachparagraphTip:Para.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.Carefulr

5、eadingTaskoneReadthetextagain,tellmehowtheauthororganizesthetext?AccordingtotimeOk,pleasequicklyfindthetimefromthetext.Ok,nextwewillreadthetextaccordingtotimeSeveralbillionyearsafterthe“bigbang”between4.5and3.8billionyearsagoManymillionsofyearslaterAbout2.6millionyearsagoTimelinePara2Severalb

6、illionyearsafterthe“bigbang”between4.5and3.8billionyearsagoTheearthwasstilljust_____________.Thenthedustsettledintoa___________.Thentheearthbecameso________andexplodetoproduceits___________.solidglobeviolentatmosphereTasktwoacloudofdustPara4ManymillionsofyearslaterThefirstsmallplantsonthesurf

7、aceofthewaterproduced_______.Early_______andallsortsoffishappeared.__________begantogrowonland.followedby_________,someare_______.others,called_________oxygenshellfishgreenplantslandanimalsinsectsamphibiansManymillionsofyearslaterWhentheplant