Unit3ConservationLesson1TheSixthExtinction课件高中英语北师大版(2019)选择性

Unit3ConservationLesson1课件by:Emily1.HowmanytimesuptotodayhaslifeonEarthalmostdiedout?a.Onceb.Fivetimesc.Morethan10times2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?a.Lessthan10%b.Nearly50%c.Morethan90%3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivityb.Naturalcausesc.UnknownreasonsHowmuchdoyouknowaboutthem?Choosetheoptionbasedonyourknowledge.白垩纪-古近纪灭绝事件恐龙大灭绝Cretaceous–Paleogeneextinctionevent奥陶纪-志留纪灭绝事件Ordovician–Silurianextinctionevent三叠纪-侏罗纪灭绝事件Triassic–Jurassicextinctionevent泥盆纪大灭绝LateDevonianextinction二叠纪－三叠纪灭绝事件Permian–Triassicextinctionevent/GreatDyingDodo(渡渡鸟),extinctflightlessbirdofMauritius(anislandoftheIndianOcean).ItwasfirstseenbyPortuguesesailorsin1507andexterminatedbyhumansandtheirintroducedanimals.Thedodowasextinctin1680.渡渡鸟，毛里求斯（印度洋上的一个岛屿）已灭绝的不能飞行的鸟类。1507年它首次被葡萄牙水手看见，后被人类以及人类引入的动物灭绝。渡渡鸟在1680年灭绝。Passengerpigeon(北美候鸽),migratorybirdhuntedtoextinctionbyhumans.From1870thedeclineofthespeciesbecameprecipitous,anditwasofficiallyclassifiedasextinctwhenthelastknownrepresentativediedonSeptember1,1914intheCincinnati(Ohio)Zoo.北美候鸽，一种因人类捕猎而灭绝的候鸟。从1870年起，该物种数量急剧下降，1914年9月1日，当最后一只已知的北美候鸽在俄亥俄州辛辛那提动物园死亡时，它被正式列为灭绝物种。夏威夷牛膝草在20世纪50年代和60年代曾遍布夏威夷的海滩。不幸的是，夏威夷成为了热门旅游目的地。这种灌木状植物的栖息地被酒店、公寓和旅游开发项目侵蚀，使其在短时间内灭绝（1990年灭绝）。Hawaianchaffflower(夏威夷牛膝草)waseverywhereonthebeachesofHawaiiinthe1950sand1960s.Unfortunately,Hawaiihasbecomeapopulardestination.Theshrubbyplant'shabitathasbeenerodedbyhotels,apartmentsandtouristdevelopments,leavingitextinctinashortperiodoftime(extinctin1990).夏威夷牛膝草在20世纪50年代和60年代曾遍布夏威夷的海滩。不幸的是，夏威夷成为了热门旅游目的地。这种灌木状植物的栖息地被酒店、公寓和旅游开发项目侵蚀，使其在短时间内灭绝（1990年灭绝）。Pyreneanibex(比利牛斯山羊),oncecommonlyfoundinSouthernFrance,NorthernPyreneesandCantabrianMountains,wasoneofthefoursubspeciesofIberianwildgoatorSpanishibex.Theywerefoundinhugenumbersevenafewhundredyearsago.However,by1900thenumberswentdowntolessthan100,andafter1910,thenumberneverwentupabove40.ThelastPyreneanibexwasCelia,afemale,founddeadintheyear2000.比利牛斯山羊曾常见于法国南部、比利牛斯山北部以及坎塔布连山脉。它是伊比利亚野生山羊或西班牙羱羊的四个亚种之一。几百年前它们的数量极为庞大。然而，到1900年时，数量下降到不足100只，1910年之后，数量从未超过40只。最后一只比利牛斯山羊是一只名为西莉亚的雌性山羊，它于2000年被发现死亡。Para1Para2Para3Para4Readparagraph1-4andgetthemainideaofeachparagraph.BackgroundinformationofextinctionMainreasonsofthesixthextinctionPossibleconsequencesofthesixthmassextinctionActionswecandotoavoidthesixthmassextinction.TheThirdExtinctionTheFifthExtinctionTheSixthExtinctionCausesEffectsSolutions1.Whatisthetexttypeofthepassage?A.Narration(记叙文).B.ArgumentativeEssay(议论文).C.ExpositoryWriting(说明文).D.NewsReport(新闻报道).Narration记叙文：时间、地点、人物、起因、经过、结果。反馈生活、思想感情。Exposition说明文：旨在解释、阐述某个主题，让读者了解事物的本质、原理、特点等。说明文通常以事实、数据、逻辑推理等方式展开论述。Argumentation议论文：以作者的观点为核心，通过提供论据和证据来支持自己的论点，说服读者接受自己的观点。论说文通常分为论点、论据和结论三个部分。AcademicEssay

学术论文：针对某个学术领域的研究，要求作者具备扎实的理论基础和严谨的研究方法。学术论文通常包含引言、正文和结论三个部分。2.Whatwayscanweuseinexposition?Findexamplesfromthepassage.A.CitingideasfromexpertsorauthoritiesB.GivingexamplesE.UsingcomparisonandcontrastD.ReferringtocommonknowledgeC.UsingdataF.GivingdefinitionA.CitingideasfromexpertsorauthoritiesB.GivingexamplesC.UsingdataD.ReferringtocommonknowledgeACDBE.UsingcomparisonandcontrastEF.GivingdefinitionF96%dinosaursasteroidssealevelsoxygencontentReadPara.1tofindtheinformationaboutextinctions.Readpara.2andgetthemainreasonsofthesixthmassextinction.Mainreasonsofthesixthmassextinction

Airandwaterpollutionforestsbeingdestroyedfactoryfarmingoverfishing.HumanactivityReadPara.3andlistthepossibleconsequencesofthesixthmassextinction.uptothreequartersofallspeciesonearthcoulddieout.Wehumanswouldalsobeatriskofdyingout.Possibleconsequencesofthesixthmassextinction1.Whatisthepurposeofthelastparagraph?A.CallonpeopletoprotecttheEarth.B.Blamepeoplefordestroyingtheenvironment.C.Urgethegovernmenttotakeaction.D.Warnthepublictoreducetheirdestructivebehaviour.√ReadPara.4andchoosethebestanswer.2.Whatshouldwedotoprotecttheearth?▲takestepstosave(1)___________________;▲changetheway(2)__________________byusingcleaner,morenaturalsourcesofenergy▲improvefarmingmethodsto(3)_________water,airandlandpollutionendangeredspeciesweworkandtravelreduce3.Whatrhetoricaldevices(修辞手法)doestheauthoruseinthisparagraph?A.Metaphor(暗喻)．B.Personification(拟人)．C.Overstatement(夸张)．D.Parallelconstruction(排比)．√CaseStudyReadtheCaseStudyanddothefollowingexercises.1.Whatdidpeopledotoprotectblackrobins?▲Wildlifeworkersbegan(1)____________forraisingblackrobinchicks.▲They(2)_________OldBlue’seggs,helpedthemto(3)______andtookcareoftheir(4)________.▲They(5)_________theirhabitatsand(6)__________smallanimalsthathuntthemfromtheislandswheretheylive.aprogrammeprotectedhatchchicksrestoredremoved2.Whatistheeffectoftheirefforts?In1980NowTherewereonly5blackrobinsleftintheworld,onlyoneofwhichwasabletolayeggs.Therearemorethan250blackrobinsandthepopulationisstillspreading.A.Humanscandowhatevertheywant.B.Theblackrobinsaresuccessfullysavedfromextinction.C.Itishumanactivitythathasaffectedthespeciesnegatively.D.It’snevertoolatetotakeactiontoprotecttheenvironment.√3.WhichclaimdidtheCaseStudysupportinthetext?课本P55Completetheparagraphaboutextinctionsusingthecorrectformofthephrasesbelow.dieoutbeknownashaveaffecteddependonwipeouttakestepstakeactionsetuptakecareofInthel