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1、Unit1keyWatchingPart1I.1.C2.C3.DII.photographingcheetahshelping(save)cheetahsMoremiWildlifeReserve,BotswanaChrisJohns,photographer;DaveHamman,guidetrucks,camerasPart2I.AII.1.inthebrush,whattheyhadbeenhopingfor2.lossofhabitat3.extinct,unspeakable4.naturalworld5.c
2、apable,gain6.makeakillPart3I.(C)→(A)→(F)→(B)→(E)→(D)II.1.week2.fine3.morning4.reedbucks5.preyIII.1.Thechallengeistokeepyourconcentration,toconstantlylook.2.Theyscaneverythingfromheavybushestoopengrasslands,hopingtocatchsightofher.3.Chrismustwaittoseeifthemotherc
3、heetahwilllethimbackintohertrust.4.Themenmustdriveasquicklyaspossibleinordertogettheshot.5.Ifanotherpredatormovedinonher,themothercouldbeambushed.Part4I.1.F2.T3.F4.T5.FII.1.clicks2.focuses3.freezes4.walks5.smell6.lickFollow-upI.Day1 :GDay2 :B,C,DDay3:FAweeklater
4、:A,EReadingReadingComprehensionDBDDCBAcapturingcautiousprotectHomeListeningI.C,D,AII.1.T2.T3.F4.F.5.FIII.1.Studieshaveshownthatalmostalllivingthingswilleventuallybecomeextinct.2.Inmanycases,replacementspeciesemergeovertime.3.Humanactivityishavingatremendousnegat
5、iveimpactonextinctionrates.4.Someoftheworld’sspeciescannotsurvivewithouthelp.5.Somegroupsmayhaveavestedinterestinnotprotectingcertainspecies.KeytoWatch,ListenandRead(Unit2)WarmupI.1.fur2.carnivore3.blubber4.Arctic5.marinemammalII.FBCGDAEPart1I.FTTTFII.Edgeinhosp
6、itablethrivemammalsurvivalfrozenadjustmentsinsulatedreservesIII.1.Oneanimalactuallythrivesinthesefreezing,lonelysurroundings.2.Thesemarinemammalsspendmostoftheirlivesonfrozenseas.3.Polarbearsdon’tenjoytheluxuryofanuninterruptedwinter.4.UnlikethehighArctic,there’
7、snopermanenticepackhere.5.WhentheBaymelts,thebearsareforcedtoshore.Part2.I.Whentheweatherstartstoturncold,largenumbersofthemgatheraroundthecoast.Atthistime,peoplecanobservethematcloserange.2.TheyareeagerlywaitingfortheBaytofreezesothattheycangobacktothefrozenice
8、andtheirfoodsource.3.Peopleuse“tundrabuggies”,aspecially-designedtruck,toseethem.4.Becausenootheranimalhuntsthem,andtheyareatthetopofthefoodchain.II.1.private2.compan
