Unit3ConservationLesson1TheSixthExtinctionReading课件高二英语北师大版选择性

Unit3Lesson1TheSixthExtinctionReading新课导入Whatdoyouknowaboutextinction?课堂学习Howmuchdoyouknowaboutextinction?Choosetheoptionbasedonyourknowledge.1.HowmanytimesuptotodayhaslifeonEarthalmostdiedout?a.Onceb.Fivetimesc.Morethan10times2.AboutwhatpercentofallspeciesonEarthbecameextinctduringthemassextinctionknownasthe“GreatDying”?a.Lessthan10%b.Nearly50%c.Morethan90%3.Whatdoscientiststhinkwillcausethenextmassextinction?a.Humanactivityb.Naturalcausesc.UnknownreasonsPre-readingReadatextaboutextinction.ThencheckyouranswersinActivity1.While-readingWhat’sthemainideaofthispassage?ExtinctionsarenotunusualinourEarth’shistory.Butwehumanbeingscantakeactiontostopdestroyingtheplanetweliveontoavoidasixthextinction.2Readthetext.Completethenotes.Thentalkaboutthedifferentaspectsofextinctions.3MeaningofextinctionHowtoavoidthesixthmassextinctionMainreasonsthatcauseextinctionsTwonotableextinctionsandtheirconsequencesThenumberofextinctionsthathaveoccurredsofarExtinctionExtinctionMeaningofextinction:_____________________________________Thenumberofextinctionsoccurredsofar:_____________________________________Twonotableextinctionsandtheirconsequences:______________________________________________________________________________________________________________________________________entirespeciesarewipedoutover90%ofallspeciesthateverlivedthethirdmassextinction,killed90%to96%ofallspecies;thefifthevent,whichoccurred66millionyearsago,causedthedeathofthedinosaursMainreasonsthatcauseextinctions:____________________________________________________________________________________________________________________________________Howtoavoidthesixthmassextinction:_________________________________________________________________________________________________________________________________________________________________________________________________volcaniceruptions,asteroidshittingtheEarthfromspace,changesinsealevels,thedecreaseofoxygencontentofthesea,globalwarmingchangethewaywelive,includingsettingupspecialareaswhereplantsandanimalscanbeprotected;changehowweworkandtravelbyusingcleaner,morenaturalsourcesofenergy;improveourfarmingmethodsReadagain.Answerthequestions.4Thestudyfoundthathowquicklyspeciesdieoutduetonaturalcauses,thatis,the“backgroundextinctionrate”.Theyfoundthathumanactivityiscausingspeciestodieout1,000timesfasterthannormal.BecausehumanactivityhasnegativelyaffectedallotherspeciesonEarth,includinganimalsandplants.3.Whydoesthewriterbelievewe’llprobablydieoutif75%oftheEarth’sspeciesdieout?4.Whatdidpeopledointhecasestudytoprotectblackrobins?Whichclaim(s)didthecasestudysupportinthetext?Becauseourworldandourlivesdependonthebalanceinnaturebetweenanimalsandplants.PeopleprotectedOldBlue’seggs,helpedthemtohatch,andtookcareofthechicks.Peoplearerestoringtheirhabitatsandremovingpestslikemiceandcatsfromtheislandswheretheylive.Thecasestudyshowedthatevenindesperatesituations,wecandosomethingtohelp.Inshort,it’snevertoolate.5GroupWork.Thinkandshare.facts

reasonsopinions/predictionssolutionsPost-reading(1)Whattypicallanguageisused?Facts:

over90%ofallspeciesthateverlivedareextinct;the“GreatDying”,whichkilled90%to96%ofallspecies;humanactivityiscausingspeciestodieout1000timesfasterthannormal.Reasons:airandwaterpollution,forestbeingdestroyed,factoryfarmingandoverfishingarecausingspeciestodieout;withoutforests,wewouldhavenoairtobreatheandwithoutcleanwaterwewouldbeunabletosurvive.Opinions/predictions:

manyscientistssaywearenowenteringtheEarth’ssixthmassextinction;scientistsbelievethatuptothreequartersofallspeciesonEarthcoulddieout.Solutions:

weneedtotakestepstosaveendangeredspecies,includingsettingupspecialareaswhereplantsandanimalscanbeprotected;weneedtochangehowweworkandtravel...;wealsoneedtoimproveourfarmingmethods...(2)Whattexttypeisthispieceofwriting?Thispieceofwritingisanexposition.Itspurposeistoexplainwhatthesixthextinctionisanditseffectsandcallonpeopletotakeactiontopreventitfromhappening.2.Whatwaysofargumentdoesthewriterusetoconvincereaders?Areyouconvinced?Whyorwhynot?Thewriteruseswayssuchascitingideasfromexpertsorauthorities,givingexamplesandusingdata.Ibelievethatifwetakeactionnowitisnottoolatetosaveotherspeciesfromextinction.Theblackrobinwassavedfromextinctionwhenonlyfivebirdsremained,soIthinkitispossibletosaveanyspeciesifweactrightnow.Usetheadjectivesandnounstomakemeaningfulexpressions.Thenuseeachexpressiontomakeasentence.Writethesentencesinthespaceprovided.6entireendangeredsignificantnaturalmasssolarchangeresourceextinctionspeciesenergyanimal+=endangeredanimalsentirespeciesnaturalresourcessignificantchangemassextinctionsolarenergyForexample:Weneedtotakeactiontoprotectendangeredanimals.Completetheparagraphaboutextinctionusingthecorrectformofthephrasesbelow.7dieoutbeknownashaveaffecteddependonwipeouttakestepstakeactionsetuptakecareofInthelast500millionyears,therehavebeenfivemassextinctioneventsonEarth.Inthethirdevent,which1.___________the“GreatDying”,90%to96%ofallspecies2._________.Ofcourse,speciesdiedoutduetomanycauses.isknownasdiedouthaseffecteddependontakeactiontakestepssetuptakecareofwipeoutKeypointsblame

vt.责怪，指责，把……归咎于n.责任，责备[归纳拓展]blame...for(doing)sth. 因(做)某事责备blamesth.onsb./sth. 把某事归咎于某人/某事betoblamefor(doing)sth. 因(做)某事应受责备；对(做)某事负有责任（不定式用主动形式表示被动意义）take/beartheblameforsth. 承担某事的责任lay/puttheblame（forsth.）on... 把(某事的)责任归咎于[即学即练]

单句语法填空1.Somepeopleblamethesmartphone_____thetragedy,yetinfactpeople’sweakeningself-controlandself-disciplineare__________(blame).2.Lotsofpeoplefindithardtogetupinthemorning,andputtheblame_______thealarmclock.fortoblameondieout

灭绝，消失[归纳拓展]

die构成的其他短语：dieoff相继死去 diefrom/of死于bedyingforsth.渴望某物，极想要某物 bedyingtodosth.渴望做某事diedown

逐渐变弱，逐渐平息dieaway

逐渐减弱，逐渐消失[即学即练]

用die的相关短语完成句子1.Withmoreandmorebirds___________,somedaysomespecieswill___________.Inaddition,someofthemhave____________environmentalpollution.2.Don’tworry.Thestrongwindwill____________soonandwecangoouttohaveabaseballmatchasplanned.3.NowI’mthirstyand_________aglassofwater.Ihavewalkedforalongtime.dyingoffdieoutdiefrom/ofdiedown/awaydyingforThereisalonglistofreasonswhysomanyspeciesaredyingout:...overfishing.导致这么多物种正在消亡的原因有很多：空气和水污染、森林被毁、工厂化养殖和过度捕捞。[归纳拓展]

reason后接定语从句的用法reason作先行词，后接定语从句时：(1)若关系词在从句中作状语，要用why或forwhich引导定语从句。▶There’sareasonwhy/forwhichpeopledon’treadthisstuff:it’snotfunny.人们不读这种东西是有原因的：它并不逗趣。(2)若关系词在从句中作主语、宾语，要用which或that引导定语从句，其中作宾语时关系词可省略。▶Hegaveusareasonthat/whichsoundedreasonable.他给了我们一个理由，这个理由听起来合情合理。(关系词在从句中作主语)▶Thereason(which/that)hehasgivensoundsreasonable.他给出的理由听起来合情合理。(关系词在从句中作宾语，可省略)[即学即练]

单句语法填空1.Thereason_______Iadmirehimis_______hispositiveattitudetolifehasagreatin