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Unit2Task1【答案】A.1)elephants2)chimpanzees3)giraffes4)penguins5)kangaroos6)zebras7)polarbearsB.1)andatail2)bigears【原文】1)TheyliveinAfricaandIndia.Theyhavefourlegsandatail.Theyareverybigandverystrong.Theyareintelligent,too.Theyhaveatrunkandsomeofthemhavetusks.Theysometimeslivefor70years.2)TheyliveinAfricaandAsia.Theyarebrown.Theyhavearmsandlegs,buttheydon’thaveatail.Theirarmsareverylongandtheyhavebigears.Theyaregoodclimbers.Theyareveryintelligent,too.3)TheyliveinAfrica.Theyareverytall.Theyhavefourlegs,atailandaverylongneck.Theyeatleavesandtwigs.Theycanrunveryfast.Theyarebrownandwhite.4)Theyliveinverycoldcountries.Theyhavewings,buttheycan’tfly.Theyaregoodswimmers.Theyeatfish.Theyareblueandwhiteorblackandwhite.5)TheyliveinAustralia.Theyareredorgray.Theyhaveshortfrontlegs,longbacklegsandaverylongtail.Thebacklegsandthetailareverystrong.Theycanrunveryfast.Thefemalescarrytheiryounginapouch.6)TheyliveinAfrica.Theyhavefourlegsandatail.Theyhaveabeautifulcoatwithblackandwhiteorbrownandwhitestripes.Theyeatgrassandplants.7)Theyliveinverycoldcountries.Theyhavefourlegs.Theyareverybigandverystrong.Theyhaveawhitecoat.Theycanswim.Theyeatsealsandfish.Task2【答案】A.1)Thecheetah.2)170km/h.3)Morethan100km/h.4)Becausemostanimalsrunonfourlegs.5)Becausewehavemachines.B.1)F,2)F,3)T【原文】Thefastestanimalonlandisthecheetah.Itcanrunataspeedofabout100kilometresanhour.Thefastestbirdintheworldcanflyat170km/h,andthefastestfishcanswimatmorethan100km/h.Humanbeingsarenotveryfast.Thefastestmanintheworldcanonlyrunatabout40km/h.Manyanimalscanrunfasterthanthis.Butmostanimalsrunonfourlegs.Fourlegsarebetterthantwo,aren’tthey?Whydoweonlyhavetwolegs?Scientistssaythatwearemoreintelligentthanotheranimalsbecausewestandontwolegs,sowecanuseourhandsforotherthings.Wecanpickthingsupwiththem.Wecanusetools.Humanbeingshaveusedtoolsformillionsofyears.Thatiswhyourbrainshavedeveloped.Thatiswhywehavebecomethemostintelligentanimalsintheworld.Inthepastfewyears,wehavemadeallkindsofmachines.Wehavemadecars,ships,aeroplanesandspacecraft.Inthesemachineswecantravelfasterthananyanimal—byland,bysea,orbyair.Wecanevengotothemoon.Nootheranimalhaseverdonethat!Task3【答案】A.1)Climate,lackoffoodandaliensfromouterspacemightberesponsiblefortheirextinction.2)No.B.B:mighthavegotten,killedthemoffA:mayhaverunoutoffoodB:couldhavebeendestroyedbyaliens【原文】A:Youknow,we’restudyingdinosaursinscienceclass.It’sreallyinteresting.B:Oh,yeah?Hey,haveyoulearnedwhythedinosaursdisappeared?A:Well,nooneknowsforsure.B:Ithoughtithadsomethingtodowiththeclimate.Thetemperaturemighthavegottencoolerandkilledthemoff.A:Yeah,that’sonetheory.Anotherideaisthattheymayhaverunoutoffood.B:Uh-huh.Andyouknow,there’sevenatheorythattheycouldhavebeendestroyedbyaliensfromouterspace.A:Thatsoundscrazytome!Task4【答案】1)Themayfly.Afewhours.2)Theyjustdotwothings:findingamateandproducingyoung.3)Wecouldjudgebyitsgrowthrings.4)Itwaskeptfor152years.【原文】Fortheshortestlife,thefirstprizemustgotothemayfly,whichtypicallylivesonlyamatterofafewhoursafteritemergesfromitsshell.Fewmayflieslivetoseethesunriseagain.Thesecreaturesdevotetheirwholelivestoasingledesperatemission:findingamateandproducingyoung.Theydon’tevenhavefunctionalmouthsandstomachs.Theysimplyhavenotimetoeat.Infacttheyhavenotimeforanythingelse.Therecord-holderforthelongestlifemaybetheArcticclam,oneofwhichlivedquietlyunderwaterfor220years.Howeveritdidnothaveanybirthcertificatetoprovethis.Onecouldonlyjudgebyitsgrowthrings.Ifyouinsistonbetterdocumentation,theoldestanimaleverwasprobablyatortoisethatdiedin1918.Ithadbeencapturedalreadyfull-grownin1766,nineyearsbeforetheAmericanRevolutionbegananditdied152yearslaterasWorldWarIcametoaclose.Task5【答案】A.Peoplehavedifferentopinionsonusinganimalsforresearch.B.1)fora.wastriedfirstonanimals.b.isdependentonc.usingunwantedanimals.2)againsta.sufferb.unnecessaryc.thesamerights3)a.cellcultureb.computermodeling.【原文】Everyyearabout17millionanimalsareusedinLaboratoryexperiments.Butinmanycountriestoday,adifficultquestionisbeingasked:Dowehavetherighttouseanimalsinthisway?Peoplewhoareforusinganimalsinresearcharguethattheuseofanimalsinmedicalresearchhasmanypracticalbenefits.Animalresearchhasenabledresearcherstodeveloptreatmentsformanydiseases,suchasheartdiseaseanddepression.Itwouldnothavebeenpossibletodevelopvaccinesfordiseaseslikesmallpoxandpoliowithoutanimalresearch.Everydruganyonetakestodaywastriedfirstonanimals.Futuremedicalresearchisdependentontheuseofanimals.Whichismoreimportant:thelifeofaratorthatofathree-year-oldchild?Medicalresearchisalsoanexcellentwayofusingunwantedanimals.Lastyear,over12millionanimalshadtobekilledinanimalsheltersbecausenoonewantedthemaspets.Howeverthosewhoareagainstitpointoutthatthefactthathumansbenefitcannotbeusedtojustifyusinganimalsinresearchanymorethanitcanbeusedtojustifyexperimentingonotherhumans.Animalssufferalotduringtheseexperiments.Theyareforcedtoliveinsmallcages,andtheymaybeunabletomove.Muchoftheresearchthatiscarriedoutisunnecessaryanyway.Animalshavethesamerightsashumansdo—tobeabletomovefreelyandnottohavepainorfearforcedonthem.Resear