视听阅读第二册Unit2PolarBearsinTrouble

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(Book2)

PolarBearsPolarbearsarebuiltforArctic.

Becausepolarbearshavemanybodycharacteristicsadaptedforpolarenvironment.

BackgroundInfoPolarBearwhiteArcticregionsondriftingoceanicicefloesswift,wide-rangetraveler,goodswimmerfood:seal,fish,seaweed,grass,birds,caribou,etc.(omnivorousanimal杂食)maritimebearPolarbearscanberegardedas“umbrellaspecies”whichareatthetopofthefoodchain.Polarbearsealfishwhaleseabirdplant5PhysicalcharacterThepolarbear'sclawsareshortandstocky.theteetharelargerandsharperPolarbearfurconsistsofdenseunderfurandguardhairs.noseHudsonBay 2ndlargestboundedbywithCanadianborderingstatesconnectAtlantictheArcticapolarregionlocatedatthenorthernmostpartoftheEarth.consistsoftheArcticOceanandpartsofAlaska(UnitedStates),Canada,Finland,Greenland(Denmark),Iceland,Norway,Russia,andSweden.consistsofavastoceanwithaseasonallyvaryingicecover,surroundedbytreelesspermafrostTheareacanbedefinedasnorthoftheArcticCircleitcanbedefinedastheregionwheretheaveragetemperatureforthewarmestmonth(July)isbelow10°C(50°F);thenorthernmosttreelineroughlyfollowstheisotherm等温线attheboundaryofthisregion.LocationoftheArcticArtificiallycolouredtopographicalmapoftheArcticregionMapfromtheU.S.GeologicalSurveyshowsprojectedchangesinpolarbearhabitatfrom2001to2010and2041to2050.Redareasindicatelossofoptimalpolarbearhabitat;blueareasindicategain.

BecausepolarbearsplayanimportantroleinArcticenvironment,scientistsfeelthatpolarbearcanbeagoodindicatorofthehealthofArcticenvironment.So,wecansaythatbyprotectingpolarbears,weareprotectingthewholeArcticecosystem.Globalwarminghasanimpactontheice.

Theiceismeltingquicklyinnorthandsouthpole.Andthathaveabadinfluenceonpolarbears.

Thepolarbearisbecomingbrownbear.

Polarbearsareindanger,wemusttakemeasurestoprotectthekindofbeautifulandlovelyanimal.Becauseitisthetreasureofnature.thesituationisthreateningthesurvivalofthespecies,andisconsideredatroublesomeindicatoroftheimpactofglobalwarmingonthewholeArcticregion.WarmupI.1.fur2.carnivore3.blubber4.Arctic5.marinemammalII.FBCGDAEPart1I.FTTTFII.EdgeinhospitablethrivemammalsurvivalfrozenadjustmentsinsulatedreservesIII.1.Oneanimalactuallythrivesinthesefreezing,lonelysurroundings.2.Thesemarinemammalsspendmostoftheirlivesonfrozenseas.3.Polarbearsdon’tenjoytheluxuryofanuninterruptedwinter.4.UnlikethehighArctic,there’snopermanenticepackhere.5.WhentheBaymelts,thebearsareforcedtoshore.Part2.I.Whentheweatherstartstoturncold,largenumbersofthemgatheraroundthecoast.Atthistime,peoplecanobservethematcloserange.2.TheyareeagerlywaitingfortheBaytofreezesothattheycangobacktothefrozeniceandtheirfoodsource.3.Peopleuse“tundrabuggies”,aspecially-designedtruck,toseethem.4.Becausenootheranimalhuntsthem,andtheyareatthetopofthefoodchain.II.1.pany3.adult4.considered5.conservationPart3I.CDBEAII.parallelsconcernedstablepatternscriticalexistenceconductedadvancementstabilitylengthimpactPart4

I.ACDBEII.(1) endangeredanimals(2) a(n)caringworld(3) a(n)keytounderstandingtheArctic(4) ensuretheirsurvival(5) conservationefforts(6) umbrellaspecies(7) thepolarbears’futureliesintheanswerstothesequestionsReading：ADCDDABtopkillers/anumbrellaspeciesThestabilityorthelengthofthetimeThesameenvironment(aspolarbears)Homelistening:I:0.6,0.8/1.4,5.8/100/1,473/2008II:1:Greenhousegasesareproducedbycarandtruckexhaust,factorysmoke,andtheburningofcertainsubstancesforheatandlight.2:Theeffectsofglobalwarmingwillmostlikelyappearinanimalpopulationsfirst.3:Environmentalgroups,notonlygovernmentalonesbutalsoprivategroups,areworkingtowardsthisgoal.4:TheUnitedNationshasorganizedinternationalgatheringstoapproachthisproblem,andhasproducedadocumentknownas