高二英语任务型阅读8、9.doc

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1、高二英语任务型阅读八AInsimplewords,hibernationisastateofdeepsleep.Hibernationdiffersfromnormalsleepinvariousways.Hibernatinganimalstakealongtimetowakeupfromtheirsleep.Turningorkickingtheirbodiesdoesnotseemtowakethemup.Evenafterwakingupfromhibernation,theseanimalstakesometimetorestarttheirnormalactivit

2、ies.Duringhibernation,theheartrateslowsdownandsomeofthenon-vitalorgansbecomeentirelyinactive.Thisisastateinwhichthebodyusesverylittleenergy.Winteristhetimewhenfoodislessandweatherrough.Animalshavetospendalotofenergyfindingfood.Eveniftheysucceedinfindinganything,itisoftennotenoughtomakeupfort

3、helossofenergy.Besides,thecoldweathermayoftenbecomeacauseofdeath.Asaresultofallthese,animalshavetoreducetheirfooddemandbyreducingenergyrequirements.Thisisachievedbyhibernatingthroughoutthewinter.Beforetheonsetofwinter,whenthereisplentyoffood,animalseatovermuchandstoremuchofthefoodintheformof

4、fat.Aswinterarrives,theyreturntotheirhomewheretheyspendtherestofwinterhibernating.Asanimalshibernate,theirbodytemperaturestartsdroppingduetolackofactivityandmetabolism（新陈代谢）.Atonepoint,itisonlyafewdegreeshigherthanthesurroundingtemperature.Whateverenergythebodyneedstoperformcertaintasksisgot

5、fromthefatstorage.Duetolackofactivity,thefatburningprocessisslowandsteady.Theenergyfromfatisenoughtokeeptheanimalalivefortherestofthewinter.Hibernationdiffersforeveryspecies.Forexample,someanimalslikeblackbearsmaysleepforthewholewinterwithoutwakingupwhileanimalslike,squirrelsmaywakeupevery4d

6、aystoeatsomefood,passwastematterfromthebody,andthengobacktosleep.Hibernationindomesticanimalsmaydifferfromthatinthewildones.Asthereisnofoodshortagefordomesticanimals,domesticanimalshibernateasaresultoftheirnaturalinstinctbutwithmoreactiveperiodsinbetween.Hibernation71.Astateofdeepsleep72.fro

7、mnormalsleep*Takingatimetowakeup*Takingsometimeto73.theirnormalactivitiesagain*UsingverylittleenergyReasonsforhibernating*Notfindingenoughfoodtomakeupforthe74.ofenergy*75.indeathduetothecoldweatherFeaturesofhibernation*Bodytemperaturedroppingbecaus