英语听力教程3第二版unit1答案文档格式.docx

英语听力教程3第二版unit1答案文档格式.docx

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globalwarming/greenhouseeffect/emissionsofCO2

　　PartIITheEarthatrisk（I）

　　A.Keys:

　　a.Morepeople--------morefirewood----fewertrees

　　b.Moredomesticanimals------moreplants-----feweravailableplantsa,b--Moredesert----movesouth-----desrttexpandingsouth----no

　　grass

　　2.Growingcropsstabilizesoil,withoutthemthetopsoiljustblowsaway.Butifthereisn'

tenoughrainthecropsdon'

tgrow.

　　3.Peopletrytogrowfoodtosupportthemselvesortocreaterancheswherecattlecanberaised,ortogethardwoodforexport,ortomakewayforanironoremine

SaharaDesert

　　2:

NorthAmerica

mostofEurope

　　3:

topsoilblowingaway

　　4:

tropicalforestsdestruction

　　5:

animal/plantspeciesbecomingextinct

　　6:

climatechangeforthewholeworld

　　PartIIITheEarthatrisk（II）

Treeswouldholdrainfallintheirroots.Whenforestsinthehigherup-riverhavebeendestroyed,alltherainthatfallsinthemonsoonseasonflowsstraightintotheriverandstartstheflooding.

Heimpliesthatsomenationalgovernmentsjustconsidertheresultsoftheirpoliciesinthenearfuture,orjustthinkasfaraheadasthenextelection.

floodinginBangladesh

Actiontobetaken

populationcontrol

　　Keys:

Warmingupoftheworld

Effectsofglobal

reducedpotentialforfoodproduction

changeofpatternsofhear-relatedfoodpoisoning,etc.

　　PartVDoyouknow…?

F2:

F3:

F4:

F5:

T

　　Dos1:

yourtowels2:

Cutout3:

awall-fire4:

fridge5:

waituntilyou'

veafullload6:

acompletemeal

　　Don’ts7:

ironeverything8:

theironup9:

thekettle10:

tothebrim

　　11:

hotfood

　　Tapescript

　　1.TheAmazonforestsaredisappearingbecauseofincreasedburningandtreeremoval.InSeptember,satellitepicturesshowedmorethan20000firesburningintheAmazon.Expertssaymostofthesefiresweresetbyfarmers.Thefarmerswereattemptingtoclearlandtogrowcrops.TheWorldWildlifeFundsaysanotherseriousproblemisthattoomanytreesintheAmazonrainforestarebeingcutdown.TheWorldWildlifeFundsaysthefiresshowtheneedforurgentinternationalactiontoprotecttheworld'

srainforests.Thegroupwarnsthatwithoutsuchactionsomeforestscouldbelostforever.

　　2.EnvironmentalissuesswelltothefullinBerlinthisweek,fortheUNspongsoredconferenceonglobalwarmingandclimatechangeisthefirstsuchmeetingsincetheRiosummitthreeyearsago.WithscientistsandgovernmentsnowgenerallyreadytoacceptthattheearthclimateisbeingaffectedbyemissionsofCO2andothergreenhousegases,overahundredcountriesaresendingdelegations.ButhowmuchprogresshasbeenmadeimplementingthegreenhousegasreductiontargetagreedonatRio?

SimonDaryreports...

　　B:

That'

sright.IntheUSA,asyouknow,intensiveagriculturerequiresaplentifulsupplyofrainforthesecropstogrow,Imeanifthereisn'

tgrow.Andgrowingcropsstabilizesoil,withoutthemthetopsoiljustblowsaway.Thisisalsotrueforanyregionthatisintenselyfarmed—mostofEurope,forexample.

　　I:

AndwhatdidyoufindinSouthAmerica?

InSouthAmerica（asinCentralAfricaandSouthernAsia）tropicalforestsarebeingcutdownatanalarmingrate.ThisisdonesothatpeoplecansupportthemselvesbygrowingfoodortocreaterancheswherecattlecanberaisedtobeexportedtoEuropeorAmericaastinnedmeat.Theproblemisthatthesoilissopoorthatonlyacoupleofharvestsarepossiblebeforethisverythinsoilbecomesexhausted.Anditcan'

tbefedwithfertilizerslikeagriculturallandinEurope.Forexample,inBrazilin1982anareaofjunglethesizeofBritainandFrancecombinedwasdestroyedtomakewayforanironoremine.HugenumbersoftreesarebeingcutdownforexportsashardwoodtoJapan,Europe,USAtomakethingslikeluxuryfurniture.Theseforestscan'

tbereplaced—theforestsoilisthinandunproductiveandinjustafewyears,ajunglehasbecomeawasteland.Tropicalforestscontainrareplants（whichwecanuseformedicines,forexample）andanimals—oneanimalorplantspeciesbecomesextincteveryhalfhour.Theseforesttreesalsohaveworldwideeffects.Youknow,theyconvertcarbondioxideintooxygen.Theconsequenceofdestroyingforestsisnotonlythattheclimateofthatregionchanges（becausethereislessrainfall）butthischangeaffectsthewholeworld.Imean,overhalftheworld'

srainforesthasbeencutdownthiscentury.

So,Brian,wouldyouagreethatwhatwegenerallythinkofasnaturaldisastersareinfactman-made?

Yes,byandlarge.Imean,obviouslynothurricanesorearthquakes,buttakeflooding,forexample.Practicallyeveryyear,thewholeofBangladeshisfloodedandthisisgettingworse.Youknow,thecauseisthatforestshavebeencutdownupinNepalandIndia,Imeanhigherup-riverintheHimalayas.Treeswouldholdrainfallintheirroots,butifthey'

vebeencutdownalltherainthatfallsinthemonsoonseasonflowsstraightintotheriverGangesandfloodsthewholecountry.ThereasonforfloodinginSudanisthesame—theforestshigheruptheBlueNileinEthiopiahavebeendestroyedtoo.

Well,thisallsoundsterriblydepressing.Um...Whatistobedone?

Imean,cananythingbedone,infact?

Yes,ofcourseitcan.First,thenationalgovernmentshavetobeforward-lookingandconsidertheresultsoftheirpoliciesintenortwentyyears,notjustthinkasfaraheadasthenextelection.Somehow,allthecountriesintheworldhavetoworktogetheronaninternationalbasis.Secondly,thepopulationhastobecontrolledinsomeway:

therearetoomanypeopletryingtoliveofftoolittleland.Thirdly,wedon'

tneedtropicalhardwoodtomakeourfurniture—it'

saluxurypeopleintheWestmustdowithout.Softwoodsarejustasgood,lessexpensiveandcanbeproducedonenvironment-friendly"

treefarms"

wheretreesarereplacedatthesameratethattheyarecutdown.

And,presumably,educationisimportantaswell.Peoplemustbeeducatedtorealizetheconsequencesoftheiractions?

Yes,ofcourse.

Well,thankyou,Brian

So,Brian,wouldyouagreethatwhatwegenerallythinkofas...er...aser...naturaldisastersareinfactman-made?

Yes,byandlarge...er...Imean,obviouslynothurricanesorearthquakes,buttakeflooding,forexample.Imean,practicallyeveryyear,thewholeofBangladeshisfloodedandthisisgettingworse.Youknow,thecauseisthatforestshavebeencutdownupinNepalandIndia...Imean...higherup-riverintheHimalayas.Trees...er...wouldholdrainfallintheirroots,butifthey'

Well,thisallsoundsterriblydepressing.Um...whatistobedone?

Yes,ofcourseitcan...er...first,thenationalgovernmentshavetobeforward-lookingandconsidertheresultsoftheirpoliciesintenortwentyyears,notjustthinkasfaraheadasthenextelection.Somehow,allthecountriesintheworldhavetoworktogetheronaninternationalbasis.Secondly,thepopulationhastobecontrolledinsomeway:

And,presumably,educationisimportantaswell.Peoplemustbeeducatedtorealizetheconsequences...um...oftheiractions?

Yes,yesofcourse.

Well,thankyou,Brian.

　　Theworldiswarmingup.Weknowthisbecauseaveragetemperaturesarethehighestsincescientistsstartedmeasuringthem600yearsago.Theincreaseisabout0.2℃everyyear.Thismayseemveryslight,butweknowthatslightchangesintemperaturecanhaveabigeffectonotherthings.Mostscientistsnowbelievethisglobalwarmingisduetohumanactivity.

　　JeffJenkinsisheadofBritain'

sClimatePredictionCenter.Heexplainshowglobalwarmingcanhappen.

　　"

Sunlightstrikestheearthandwarmsitup.Atthesametimeheatleavestheearth,butpartofthatistrappedbycarbondioxideandothergasesintheearth'

satmosphere.Thathasbeenhappeningeversincetheearthwasformed.Butthefearisthatincreasingamountsofcarbondioxideproducedbyindustrialprocessesandtransportandsoonwillleadtoagreaterwarmingoftheearth'

ssurface.Sothat'

stheglobalwarmingthatpeopleareconcernedabout."

　　Peoplearemostconcernedabouttheuseoffossilfuels.Fossilfuelsareoil,coal,woodandsoon.Whentheseburn,theyproducethegascarbondioxide.Manyscientistsagreethatanincreaseintheamountofcarbondioxideandsomeofthegasesintheatmospherewillincreasetheamountofwarming.Computersarebeingusedtopredictwhatthismaymean.Theyshowedthattherecouldbegreatchangesinrainfallandtheriseinthesealevelasicecapsinthenorthandsouthpolesmelt