unit4：HowlifebeganontheearthPeriod1:WarmingupandReading导学案编制人：莫玲玲审核人：_______编制时间:2015/3/25【学习目标】通过本节课的学习，你需要达到以下目标1.知识目标(1)掌握以下单词以及短语Astronomy,system,religion,theory,atom,billion,globe,violent,carbon,dioxide,atmosphere,unlike,fundamental,harmful,acid,chain,multiply,oxygen,exist,thus,puzzleintime,carbondioxide,layeggs,givebirthto,inone’sturn,prevent…..from(2)通过本文学习，掌握地球生命的起源。2.能力目标(1)能够运用一定的阅读技巧,如寻读,略读,关键词,根据语境猜测词意等,找到文章的主旨以及文章的细节信息.提高阅读能力.(2)能够用英语谈论有关天文学的话题.3.情感态度价值观通过本文的学习,提高环保意识,爱护地球.【学习重点】掌握地球生命的进化过程.【学习流程】■自主学习：■合作探究：■展示提升：【学法指导】在学习过程中，要在独立思考的基础上，通过小组讨论，相互启发，共同完成学习任务。【课前预习】把下列单词的中文意思写出来(尽量回忆不看书)astronomy___________atom___________globe_______multiply______dissolve_______acid____________atmosphere___________carbon___________dioxide___________nitrogen_________oxygen________shellfish_________insect_________amphibian___________reptile____________mammal______在书本中找出下列短语太阳系______________围绕着转_______________与…匹配______________生命的起源___________…的观点______________根据______________以…开始_____________向各个方向_____________在…和…之间___________最终，及时______________冷却，变凉______________在表面______________生命的发展____________水的长期存在___________允许…做某事___________把…溶解在…里_________连锁反应______________使…成为可能__________用…把…填满___________也,又______________第一次_____________下蛋______________恐龙时代______________仍然是个谜_____________与…不同______________分娩，产生______________接着，轮到某人__________照顾,照看_____________阻止/制止…做某事_______逃出，逃避______________因此______________太…以至于_____________依赖,依靠_____________【自主学习】Task1:Readthetextquicklyandmatchthemainideawitheachparagraph.Para.1Theformation(形成)oftheearthPara.2TheimportanceofwaterforlifePara.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.Task2:Listentothetapecarefullyandfillintheblanks.TimeWhathappenedBigbang_________begantoformandcombinetocreatestarsandotherbodies.Between4.5and3.8billionyearsago●Dustsettledintoa______andviolentglobe.●Theearthexplodedtoproduceits___________.●Thecontinued________ofwaterallowedtheearthtodissolveharmfulgasesand_____intotheoceansandseas.【合作探究】Task3:Readpara.4and5,puttherightorderofthedevelopmentoflife.（）Insectsandamphibiansappeared.（）Dinosaursappeared.（）Smallplantsgrewonthewater.（）Reptilesappeared.（）Plantsbegantogrowondryland.（）Shellfishandotherfishappeared.（）Cleveranimalswithhandsandfeetappeared.（）Mammalsappeared.Task4:Choosethebestansweraccordingtothepassage1.Whywastheearthdifferentfromotherplanets?A:ItproducedalotofheatB:ThewaterremainedC:WaterdisappearedD:Itwastheoldestplanet2.Whywasitnecessaryforplantstogrowbeforeanimals?A:AnimalsneededplantstoprotectthemfromthesunB:Plantsprovidedoxygenforanimalstobreathe.C:Animalscouldhidefromhuntersinforests.D:Itwaseasierforplantstogrow.3.Whatproblemiscausedbyhumanbeings?A:TheyexisteverywhereontheearthB:TheycauseglobalwarmingC:TheyfindnewmethodsofgrowingcropsD:Theyenjoyhuntingandfishing【展示提升】Task5:discussion1.What’stheproblemcausedbyhumanbeings?2.Whatcanwedotosolvethisproblem?Sentencepattern:tosolvethisproblem,weshould:(1)______________________________________________(2)______________________________________________(3)______________________________________________【学习反馈】通过这节课，我学会了1._________________________________________________________2._________________________________________________________3._________________________________________________________有哪些知识点或语言点是我没有掌握的或者掌握的不够1.__________________________________________________________2._________________________________________________________
