Unit1WelcometotheunitReading課件-高中英語(yǔ)牛津譯林版（2020）必修第三冊(cè)

Unit1

NatureinthebalanceWelcome+ReadingPayattentiontothefiguresrainforestTheoldestlivingecosystemsontheplanet:

Somecantracetheiroriginsto70millionyearsagotwotypes:temperateandtropicalmakeupabout6%ofthesurfaceareahometooverhalfoftheWorld’splantandanimalspeciesinadditiontoingredientsusefulineverydayproductsandmedicines,infact,anestimated70%oftheplantsusedincancertreatmentsareonlyfoundinrainforests.absorbvastamountsofcarbondioxideandconvertthemintooxygen,about40%oftheplanet’sbreathableair.Atthecurrentrate,rainforestmaycompletelydisappearwithinthenextcentury.Lead-inLetusnot,however,flatterourselvesovermuchonaccountofourhumanvictoriesovernature.Foreachsuchvictorynaturetakesitsrevengeonus.—FredrichEngelsWelcometotheunitListentothesong!

1.Howdoyouunderstand“harm”and“alarm”?“Harm”meanssomethingbadwehavedonetotheearth,includingpollutingsoilsandseas,cuttingdowntoomanytrees,

etc.“Alarm”meansthesignalthatwarnsusofthedangersofenvironmentaldamage,whichurgesustofindasolution.2..Whatisthemassageofthesong?HumanshavedonemuchharmtotheEarth,andwehavetotakeactiontochangethissituation.TheAmazonrainforest:anaturaltreasureWhatwillbetalkedaboutinthetextaccordingtothetitleandthepicture?Whatcouldbethegenreofthearticle?PredictionReadthepara.1.Whataspectswillbementionedinthefollowingparagraphs?Para.1:IntroductiontotheAmazonrainforestPara.2:BasicinformationabouttherainforestPara.3:_____________________________________Para.4:______________________________________Para.5:______________________________________Plantbiodiversity;levelsoftherainforestAnimalbiodiversity;foodchainTherainforest’svaluetothehumanrace;threatstotherainforestCompletepartA1onpage4withthemainideaofeachparagraph.Fastreading:mainidea6,4006million817%20%40040,0001,300Fastreading:figuresWhatisthepurposeofusingsomanyfigures?Besidesjustlistingthefigures,howdoesthescriptmakethefigures,thelargefiguresinparticular,understandable?Tosupportthestatementandmakethestatementmorepersuasiveandconvincing;tovivifythefiguresandthefacts;Thinkabouttwoquestions:Bymakingcomparisonswithfigures.asystemofrootsTheforest’sdifferentlevelssupportanunbelievablevarietyofwildlife.thetopsofthetallesttreesthemassofleaflittershorterplantswithlargeleavestoweringancienthardwoodsReadpara.3andfigureoutdifferentlayersoftheforest.JaguarsInsectsAtleast87species,includingfrogsLeavesandfruitMicroorganismsfeedon

breakdownfeedon

feedon

While

asignificantnumberofjaguarssurvivehere,theyareonlyoneelementofthisforest’sfoodchain.Readpara.4andfigureoutthefoodchainofajaguar.WhatmakestheAmazonrainforestanaturaltreasureaccordingtothescript?Whatisyouranswertothequestionattheendofthescript?

Canweaffordtodamagethe“l(fā)ungsoftheplant”?Whatcanwedotohelpmaintainadelicateecologicalbalance?

DiscussionReadpara.5anddiscussthefollowingquestions

TheAmazonrainforestisunique,beautifulandvaluable.Itcontains10%ofallknownspeciesontheEarth.Itproducesover20%oftheplanet'soxygen.Itswonderfulplantandanimalspecieshaveenabledhumanstomakeamazingdiscoveries.WhatmakestheAmazonrainforestanaturaltreasureaccordingtothescript?No.TheAmazonrainforestisfartooimportantforustoallowittobedestroyed.Ithelpsmaintainthebalanceoftheecosystemandprovidesoursocietywithfoodandmedicine.2.Whatisyouranswertothequestionattheendofthescript?

Canweaffordtodamagethe“l(fā)ungsoftheplant”?Reduce,reuse,andrecycle.Cutdownonwhatyouthrowaway.Followthethree"R's"toconservenaturalresourcesandlandfillspace.Shopwisely.Buylessplasticandbringareusableshoppingbag.Uselong-lastinglightbulbs.Energyefficientlightbulbsreducegreenhousegasemissions.Alsoflipthelightswitchoffwhenyouleavetheroom!Plantatree.Treesprovidefoodandoxygen.Theyhelpsaveenergy,cleantheair,andhelpcombatclimatechange.Bikemore.Driveless.takepublictransports.3.Whatcanwedot