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1听说训练PartA朗读材料第一期It’sspringonthenorthsideofourplanet.Thesun,afteranabsenceofsixmonths,breaksthehorizonforthefirsttime.Afemalepolarbearcomesoutofherdenbeneaththesnow.Thesunmustbeawelcomereliefaftersolonginthedarkness.Herdenisonahighslope,wellawayfromhungrymalebearswhowouldkillhercubs,butcloseenoughtotheseaicewhereshecanfindfoodforherextraordinarynewfamily...threeyoungcubs.Ifshecanraisethemallindependently,it’llbearareachievement.第二期Babychimpanzeesspendyearslearningabouteachotherandtheirtraditions.Familiesaretheschools.InCentralAfrica,chimpanzeescracknutswithrocks.Thetrickispassed,mothertobaby,downthegenerations.It’spartoftheirculture.InEastAfricatheycatchwhiteantsusingtwigs.Babieswatchandlearn.Theygetthebasicsalmostimmediately.It’ssomethingtodowithastick.Insomespecialconditions,themothertriestohelpandispushedawaybytheyoungster.Withendlesspatience,shetriesagain.Youngchimpanzeesgetenormouspleasurefromwhiteantfishing.第三期Here,atthefareasternendoftherangeinChina,onecreaturehastodealwiththebitterwintersoutintheopen.Mostotherbearswouldbesleepingundergroundbynowbutthegiantpandacan’tfattenupenoughtosleep.Itsfood,bamboo,onwhichittotallyrelies,hassolittlenutritionalvaluethatitcan’tbuildupastoreoffatlikeotherbears.Mostofthecreaturesheremoveupordowntheslopeswiththeseasons,butthepandaisheldprisonerbyitsdiet,forthekindofbambooiteatsonlygrowsatthisaltitude.第四期Finally,themotherandthecalfappearfromthedust.Blindedbythesand,thecalfbarelyhasthestrengthtogoon.Thestormhasdieddown,butnotalltheanimalshavebeensolucky.Oneyoungstergotlost.Thirstyandexhausted,itfollowsthetracksofhismother,butinthewrongdirection.Wheredustmeetswater,themarchofthedesertsends.Sandgiveswaytograss.Grassisagreatunsungheroinourplanet.Itkeepsdesertsincheckandfuelsmanyofearth’sgreatsights.2第五期Adultlionshuntbestworkingasapride,butthissinglemotherisalone,soprovidingforherfamilyofthreeteenagecubsisalldowntoher.Thisantelopesarefast,withexcellenteyesight,andsoduringtheday,catchingoneisextremelydifficult,butasnightfalls,theadvantageswingstothehunter.Forthemotherlioness,huntingisaseriousbusiness,bestdonewithoutherthreecubs.Intheblackofthemoonlessnight,boththeantelopeandlionessarereducedtonearblindness.Theycansmelleachother,butthelionesscan’tpinpointatargetunlessitmakesasound.第六期Themoon’smonthlycycleanditsinfluenceonthetidescausesmanyeventsintheocean,butthereisanevenlongerrhythmthathasthegreatesteffectofall—theannualcycleofthesun.Thesunpositionrelativetotheearthchangesthroughtheyearanditisthisthatproducestheseasons.Inthenorth,springcomesasthesunbeginstorisehigherinthesky.OffthenorthwestcoastofNorthAmerica,theseasaretransformedbytheincreasingstrengthofthesunshine.HereinAlaskathecoastalwatersturngreenwithasuddenbloomofseaplants.第七期LakeMalawiisastablebodyofwater,wherelifeisshelteredfromextremesofclimate,butthearrivaloftherainshasagreatinfluenceonallitsinhabitants.Eruptingfromthelakesurfacearebillionsofflies,formingclouds2kmshighand5kmswide.Nooneknowswhatcausesthisevent:perhapsthecycleofthemoonormaybethehammeringofraindropsonwater.Fortheflies,thejourneyfromthelakebedisdangerous.They’reafeastforswallowsandswifts,fatteningupbeforetheirlongmigrationtoEurope.Afterlayingtheireggsonthelakesurface,theydie,allwithinafewdays.第八期Atthenorthernextremeofourplanet,thesunrisesforthefirsttimeinmonths.Thelightshinesonaverydifferenticeworld.UnlikeAntarctica,theArcticisavastfrozenseasurroundedbyland.Herewinteriscomingtoanend,butthisbleakwildernessremainslockedinice.Eiderducksbreakthesilence.Theyhavestayedhere,bravingthenorthernwinter,insteadofflyingsouthtowarmerplaces.Flocksof40,000sweepacrossthefrozenwastes.Theyallhavethesamegoal,apermanentholeintheseaice,keptopenthroughoutthewinterbystrongoceancurrents.