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1、高一英语必修高一英语必修 3 3 第第 4 4 单元第一课时导学单元第一课时导学 案案 Learningaims . Learnabouttheoriginanddevelopmentoflifeonearth. 2. masterthenewwordsandexpressionsinthereadingpassage. 课前预习 Findoutsomeknowledgeaboutastronomybeforeclass warmingUp Thinkaboutthesequestionsandthendiscussthemwithyourp artner. . Inoursolarsyste
2、meightplanetscirclearoundthesun.what arethey?canyoumatchthenameswiththeplanets? 2. whatinterestsyouinastronomy?Doyouknowanyquestionsth atastronomersareinterestedin? 课堂阅读 Task1.Pre-reading . Theoriginoflifeonearthisaquestionthatinterestsastro nomers.whatdoyouknowaboutit? 2. Earthreligionandculturehas
3、itsownideasabouthowlifebe ganontheearth.whatdoyouknow? 3. Readthetitleandlookatthepictures.Predictwhattheread ingwillbeabout.Thenreaditquicklytocheckifyouarerigh t. Task2.Skimming Skimoverthepassageandfindthemainideaofeachparagraph. Paragraph1: a.Theimportanceofwaterforlife Paragraph2: b.Thedevelopm
4、entofplantsandanimalsontheearth Paragraph3: c.Theformationoftheearth Paragraph4: d.Awidelyacceptedtheoryabouttheformationoftheuniver se Paragraph5: e.Thearrivalofhumansandtheirimpactontheearth Task3.Skipping Puttheorderofdevelopmentoflifeintoatimeline. .Insectsandamphibiansappeared. 2.Dinosaursappea
5、red. 3.Theearthbecameasolidball. 4.Smallplantsgrewonthewater. 5.Reptilesappeared. 6.Plantsbegantogrowondryland. 7.Theearthwasacloudofdust 8.waterappearedontheearth 9.Shellfishandotherfishappeared. 0.Theuniversebeganwitha“BigBang”. 1.cleveranimalswithhandsandfeetappeared 2.mammalsappeared. Task4.Deta
6、iledreading Para1: . Howdidtheearthbegin? Para2: . whatappearedaftertheBigBang”? 2. whatismoreimportant? Para3: . whywastheearthdifferentfromtheotherplanets? Para4: . whydidtheplantsgrowbeforetheanimalscame? 2. whyisitwrongtoshowfilmswithdinosaursandpeopletogeth er? Para5: . whatdoesthe“smallclevera
7、nimalswithhandsandfeet”re ferto? 2. whatproblemiscausedbytheseanimals? 随堂检测 Task1.Finishthechartusingthephrasesbelow: . _ 2._ 3._ 4._ 5._ 6._ 7._ 8._ 9._ A:smallplantsinwater B:shellfishandallsortsoffish c:greenplantsonland D:insects E:amphibians F:forests G:reptiles H:dinosaurs I:mammals Task2.Rete
8、llthepassage. Afterthe“BigBang”,theearthwasjustacloudofdust.Ite xplodedwiththefireandrock,which1._produce dwatervapourandallkindsofgasesandformedtheearths2._ _. Astheearth3._,waterbegantoappearonits surface.waterstayingontheearthallowedtheearthto4._ _harmfulgasesintotheoceansandseas.Thatmadei tpossi
9、bleforlifetodevelop. Latersmallplantsbegantogrow.They5._andfi lledtheoceansandseaswithoxygen,whichencouragedthede velopmentofearlyshellfishandallsortsoffish. Laterthefirstgreenplantsappearedonland,followedbyla ndanimals.whendinosaursdisappeared,mammalsbecamemor eimportant.Theygave6._totheirbabies. Smallcleveranimals,nowspreadallovertheearth.Butthey arenottakinggoodcareoftheearth.Theearthmaybecome7._ _hotforthelivestoliveon,becausetheyareputtin gtoomuchcarbondioxideintotheatmosphere,which8._ _heat9._escapingfromtheearthintospace. whetherlifewillcontinuewill10._whethert hisproblemcanbesolved.
