高中英语：unit4Astronomy课件 人教版必修3.ppt

unit4astronomy thescienceofthestars readinghowlifebeganontheearth leading in thisunitisaboutastronomyandhowhumanbeingsfirstevolvedontheearthandunderstandtheuniversearoundthem eachreligionandculturehasitsownideasabouthowlifebeganonearth whatdoyouknow 1 神造说 godmade 这一假说认为地球上的各种生物都是由神创造出来的 生命是上帝或神按照一定的目的 一次性地创造出来的 pan guseparatestheskyfromtheearth panguseparatedtheearthandskywithanax afterhedied hisbreathbecamewindandcloud hisvoicebecamethunderandhislefteyesunandrightonemoon armsandlegsbecameedgesandmountains bloodbecameriversandtendon 筋脉 becameroads musclesbecamefieldsandairstars teethandbonesbecamemetals pearlsandjade sweatbecamerain thegoddessnuwamendedtheheavenandcreatedhumanbeingsfromtheclay 粘土 thebiblicalaccount day1 godseparatedlightfromdarknesscreatingdayandnightday2 godseparatedthewatercreatingskyandoceanday3 godcreateddryland day4 godspokeandcreatedthesun moonandstarsday5 godspokeandcreatedlivingcreaturesintheairandseaday6 godspokeandcreatedthelandanimalsandmanday7 godrestedandblessedthisdaycallingitholy 2 宇宙生命论 lifeintheuniverse 这一假说提倡 一切生命来自生命 的观点 认为地球上最初的生命来自宇宙间的其他星球 即 地上生命 天外飞来 3 非生命物质 non livingmaterial 地球上原本没有生命 生命起源于非生命物质 宇宙大爆炸 bigbang 后 地球只是一团尘埃 然后形成固体球状 经过后期的动荡 球体爆炸喷出烈火与岩石 并释放出碳 氮气 水蒸气和其他气体 形成地球大气层 地球冷却后 地面就有了水 形成了原始海洋 原始海洋中的有生命特征的蛋白质和核酸等物质凝聚成独立体系最后经历漫长 复杂的进化 最终形成原始生命 theuniversebeganwitha bigbang afterthe bigbang somethinghappenedtotheearth nowlet sturntopassage25 howlifebeganontheearth readthroughthetextquickly andanswerthesetwoquestions 1 what sthemainideaofthetext 2 whatisthemainideaofeachparagraph fastreading q1 what sthemainideaofthetext a howdidwaterbegin b howdidearthbegin c howdidmanbegin d howdidlifebegin d awidelyacceptedtheoryabouttheformationoftheuniverse c theformationoftheearth a theimportanceofwaterforlife b thedevelopmentofplantsandanimalsontheearth e thearrivalofhumansandtheirimpactontheearth q2 detailedreadingthistextcanmainlydividedintotwostages stage1 thedevelopmentoftheearthstage2 thedevelopmentoflife para1 3 para4 5 stage1 thedevelopmentoftheearth 1 afterthebigbang whatwastheearthlike acloudofdust asolidglobe explodedwithfireandrock producedwatervapourandgases 2 whathappenednext 3 whatdidthewatervapourandgasesform theearth satmosphere waterappeared 4 whatappearedastheearthcooleddown waterisimportantforthebeginningoflifeontheearth bigbang asolidball theearth atmosphere combineinto explodewithfireandrocktoproducecarbon nitrogen watervapourandothergases dissolveharmfulgases bigbang acloudofdust asolidglobe atmosphere water oceansandseas cooldown after bestill whyiswatersoimportantforthebeginningoflife becausewaterallowedtheearthtodissolveharmfulgasesintooceansandseas stage2thedevelopmentoflife smallplantsappearsinwater 1 whatlifedevelopedafterwaterappeared shellfishandallsortsoffish 2 whatlifedevelopedinwaternext greenplantsbegantogrowonland insectsappeared 3 whataboutthelifeonland amphibiansonlandandinthewater forests 4 whatlifedevelopednextonland reptilesappeared dinosaurdeveloped 5 whatlifedevelopedafterforestsappeared mammalsonland 6 whatlifedevelopedafterdinosaurs smallcleveranimals 7 whatlifedevelopedaftermammals smallplantsinthewater greenplantsonland insectsonland mammalsonland 1 2 1 2 3 shellfishandallsortsoffish amphibianonlandandinwater forests reptilesonland dinosaursonland life plants animals 3 4 cleveranimalsonland thelastthreeparagraphsagainandcompletetheblanks finallyabout2 6 yearsagosomesmall animals nowwithhandsandfeet and allovertheearth thustheyhave intheir becometheimportantanimalsonthe buttheyarenotlookingaftertheearth theyareputtingtoomuchcarbondioxideintotheatmosphere which heatfromescapingfromtheearthintospace asa ofthis manyscientistsbelievetheearthmaybecometoohottolive million clever appeared spread turn planet prevents result on asastudent whatlittlethingscanwedofortheearth step5discussion topreventtheearthfromgettinghotter