Unit3ConservationLesson1TheSixthExtinction課件-高中英語北師大版選擇性2

Unit

3

ConservationLesson

1TheSixthExtinction（1）高二年級(jí)英語學(xué)科文本分析What（主題）Why（意義）How（形式）通過引導(dǎo)學(xué)生閱讀文章、梳理物種滅絕的細(xì)節(jié)信息，促使學(xué)生意識(shí)到問題的嚴(yán)峻性：第六次滅絕不同于前五次，它的出現(xiàn)將是人為原因?qū)е碌慕Y(jié)果，而且，這一次的滅絕事件將是歷史上滅絕事件中最快的一次；以及人類活動(dòng)和自然環(huán)境息息相關(guān)，不當(dāng)?shù)娜祟惢顒?dòng)會(huì)造成自然的破壞、進(jìn)而反作用于人類自身，為此人類應(yīng)積極采取措施，保護(hù)自然。本課TheSixthExtinction是本單元第一課，屬于“人與自然”主題，是一篇說明文。文章主要介紹了物種滅絕的史實(shí)、原因及應(yīng)采取的行動(dòng)，旨在引導(dǎo)學(xué)生意識(shí)到物種滅絕問題的嚴(yán)峻性。文章采用了描述狀態(tài)、闡釋原因、提出建議的篇章結(jié)構(gòu)，介紹了歷史上的五次大滅絕的背景，分析了第六次大滅絕可能發(fā)生的原因、后果，以及可以采取的行動(dòng)。在說明過程中恰當(dāng)?shù)剡\(yùn)用了定語從句，尤其是非限制性定語從句；通過從句的應(yīng)用，補(bǔ)充說明了很多專有名詞的細(xì)節(jié)。同時(shí)使用一般過去時(shí)與一般現(xiàn)在時(shí)介紹過去的五次大滅絕的結(jié)果與現(xiàn)在人類無節(jié)制的發(fā)展導(dǎo)致的環(huán)境破壞行為，延伸到未來第六次大滅絕使用了虛擬語氣作為對(duì)比，更加體現(xiàn)了人類對(duì)于環(huán)境的重要性。Attheendofthelesson,studentswillbeableto:1.能獲取文章的主要信息、觀點(diǎn)，理解語篇的意義，了解物種滅絕的史實(shí)和原因及應(yīng)采取的行動(dòng)；2.能區(qū)分語篇中的主要事實(shí)和觀點(diǎn)，識(shí)別語篇的文體類型、寫作手法和邏輯結(jié)構(gòu)；LearningObjectives學(xué)習(xí)理解應(yīng)用實(shí)踐遷移創(chuàng)新3.能結(jié)合文章邏輯結(jié)構(gòu)描述物種滅絕的史實(shí)、原因及應(yīng)采取的行動(dòng)；4.通過對(duì)物種滅絕問題的分析和討論，運(yùn)用“事實(shí)—原因—解決”的邏輯表達(dá)方式談?wù)撃撤N瀕危動(dòng)物。1

ActivateandShare2

ReadandExplore3

FocusonLanguage4

ExpressYourselfCONTENTS目錄Activateandshare01Whatisextinction?Extinction:asituationinwhichsomethingnolongerexistsonourplanet.Howmuchdoyouknowaboutextinction?Choosetheoptionbasedonyourknowledge.1.HowmanytimesuptotodayhaslifeonEarthdiedout?a.Once.b.Fivetimes.c.Morethan10times.2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemass

extinction

knownasthe“GreatDying”?a.Lessthan10%.b.Nearly50%.c.Morethan90%.3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivity.b.Naturalcauses.c.Unknownreasons.Exercise1ReadandExplore02Readthetextquicklyandcheckyouranswersinexercise1.1.HowmanytimesuptotodayhaslifeonEarthdiedout?a.Once.b.Fivetimes.c.Morethan10times.2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemass

extinction

knownasthe“GreatDying”?a.Lessthan10%.b.Nearly50%.c.Morethan90%.3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivity.b.Naturalcauses.c.Unknownreasons.Exercise2Readthetextquicklyandmatchtheheadingstoeachparagraph.Para.2Para.3Para.4howwecandowhotoblame(causes/reasons)whatmighthappenbackgroundhistoryExercise2Readthetextagain.Completethenotes.Thentalkaboutthedifferentaspectsofextinctions.Exercise3entirespeciesarewipedoutfivethe3rdmassextinction,killed90%to96%ofallspecies;the5thevent,causedthedeathofdinosaursMainreasonsthatcauseextinctions:volcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseoftheoxygencontent(含氧量)oftheseaandglobalwarmingHowtoavoidthesixthmassextinction:changethewayweliving,includingsettingupspecialareaswhereplantsandanimalscanbeprotected;changehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy,suchaswindandsolarenergy;improveourfarmingmethodsTalkaboutthedifferentaspectsofextinctionsaccordingtothemindmap.Readagain.Answerthequestions.Exercise41.Whatdidscientistsfindoutin2015?The2015studylookedathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Thescientistsfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.Exercise4BecausehumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.3.Whydoesthewriterbelievewe’llprobablydieoutif75%oftheEarth’sspeciesdieout?Becauseourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.Exercise44.Whatdidpeopledointhecasestudytoprotectblackrobins?Whichclaim(s)didthecasestudysupportinthetext?PeopleprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitats,andremovingpestslikemiceandcatsfromtheislandswheretheylive.Thecasestudyshowedevenindesperatesituations,wecandosomethingtohelp.Inshort,it’snevertoolate.Exercise4Usedifferentcolouredpenstohighlightatleastoneexampleforeachofthefourelementslistedbelowindifferentcoloursandthenanswerthefollowingquestions.Exercise5Facts:Over90percentofallspeciesthateverlivedarenowextinct.(P1)Inthelast500millionyears,therehavebeenfivetimeswhenlifeonEarthhasalmostended.(P1)Humanactivityiscausingspeciestodieout1,000timesfasterthannormal.(P2)…

Exercise5Opinions/Predictions:ManyscientistssaywearenowenteringtheEarth’ssixthmassextinction.(P1)ScientistsbelievethatuptothreequartersofallspeciesonEarthcoulddieout.(P3)…

Exercise5Reasons:Thereasonsforextinctionsarevaried.Theyincludevolcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseoftheoxygencontentoftheseaandglobalwarming.(P1)Thereisalonglistofreasonswhysomanyspeciesaredyingout:airandwaterpollution,forestsbeingdestroyed,factoryfarmingandoverfishing.(P2)…

Exercise5Solutions:Weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected.(P4)Weneedtochangehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy.(P4)Wealsoneedtoimproveourfarmingmethodstoreducewater,airandlandpollution.(P4)…

Exercise5Answerthefollowingquestions.Exercise5Thispieceofwritingisanexposition.Whattexttypeisthispieceofwriting?Narration(記敘文)Description(描寫文)Exposition(說明文)Argumentation(議論文)Exercise5（對(duì)語言能力較弱的學(xué)生，可以把問題都改成選項(xiàng)的形式）

Itspurposeistoexplainwhatthesixthextinctionisanditseffectsandcallonpeopletotakeactiontopreventitfromhappening.Exercise5Thelanguageinthearticleisformalandimpersonal,objectiveandaccurate,andconciseandclear.Thewriteravoidsusingcolloquialisms(口語),the

firstperson,andexpressionslike“Ibelieve”“Ithink”“probably”“perhaps”or“maybe”.Thewordsandsentencesaresimple,plainandeasytounderstand.3.Whattypicallanguageisused?Exercise5Thewriteruseswayssuchascitingideasfromexpertsorauthorities,givingexamplesandusingdata.Ibelievethatifwetakeactionnowitisnottoolatetosaveotherspeciesfromextinction.Theblackrobinwassavedfromextinctionwhenonlyfivebirdsremained,soIthinkitispossibletosaveanyspeciesifweactrightnow.4.Whatwaysofargumentdoesthewriterusetoconvincereaders?Areyouconvinced?Whyorwhynot?Exercise5FocusonLanguage03Usetheadjectivesandnounstomakemeaningfulexpressions.Exercise61.Actnowbefore___________arelosttoglobalwarming.2.Naturalreservesshouldbesetuptoprovidehomefor_________________.3.Thepandemichasbroughtabouta_______________inthewaywework.4.Chinaisrichin______________.5.Evidenceshowsthathumanactivityistoblameforthecurrent_____________.6.Costsfor__________havebeendeclining,astechnologyimproves.entirespeciesendangeredanimalssignificantchangenaturalresourcesmassextinctionsolarenergyCompletethesentenceswiththecorrectformsoftheexpressionsinExercise6.Option1氣候變化是所有物種面臨的最緊迫的威脅。（entirespecies）

Climatechangeisthemosturgentthreatfacingourentirespecies.2.照料瀕危動(dòng)物是我們的職責(zé)。（endangeredanimals）Itisourdutytocareforendangeredanimals.3.他忽視了稅務(wù)法律中的一個(gè)重大變化。（significantchange）

Heneglectedasignificantchangeinthetaxlaws.4.政府應(yīng)該采取一些措施去保護(hù)自然資源。（naturalresources）

Thegovernmentshouldtakesomemeasurestopreservethenaturalresources.TranslatethesentencesintoEnglishwiththehelpoftheexpressionsinExercise6.Option25.這是個(gè)關(guān)于在大規(guī)模的物種滅絕時(shí)代如何保護(hù)野生動(dòng)物的故事。（massextinction）

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