值得背诵的英语文章精粹

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1、环球雅思学术写作中心www.ielts.com.cn/writing1CellsandTemperatureCellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchnarrowerlimitsmarktheboundariesofeffectivefunctioning.Enzymesystemsofmammalsandbirdsaremostefficientonlywithinanarrowrangearound37C;adepartureofafewdegree

2、sfromthisvalueseriouslyimpairstheirfunctioning.Eventhoughcellscansurvivewiderfluctuationstheintegratedactionsofbodilysystemsareimpaired.Otheranimalshaveawidertoleranceforchangesofbodilytemperature.Forcenturiesithasbeenrecognizedthatmammalsandbirdsdifferfromotheranimalsi

3、nthewaytheyregulatebodytemperature.Waysofcharacterizingthedifferencehavebecomemoreaccurateandmeaningfulovertime,butpopularterminologystillreflectstheolddivisioninto“warm-blooded”and“cold-blooded”species;warm-bloodedincludedmammalsandbirdswhereasallothercreatureswerecons

4、ideredcold-blooded.Asmorespecieswerestudied,itbecameevidentthatthisclassificationwasinadequate.Afencelizardoradesertiguana—eachcold-blooded----usuallyhasabodytemperatureonlyadegreeortwobelowthatofhumansandsoisnotcold.Thereforethenextdistinctionwasmadebetweenanimalsthatm

5、aintainaconstantbodytemperature,calledhome0therms,andthosewhosebodytemperaturevarieswiththeirenvironments,calledpoikilotherms.Butthisclassificationalsoprovedinadequate,becauseamongmammalstherearemanythatvarytheirbodytemperaturesduringhibernation.Furthermore,manyinverteb

6、ratesthatliveinthedepthsoftheoceanneverexperiencechangeinthedepthsoftheoceanneverexperiencechangeinthechillofthedeepwater,andtheirbodytemperaturesremainconstant.enzyme[‘enzaim]n.(生化)enzymesystem酶体系，酶系，释义酶系mammal[‘mamel]（脊椎）哺乳动物aquaticmammal水栖哺乳动物departure离开；出发；违背thedepa

7、rtureof….的背离，。。。的偏差impair[im’pe]vt.损害；削弱；减少severelyimpairhealth严重风险安康integrated[‘intigreitid]adj.整体的；综合的；使。。成整体互相协调的integratev.整合fluctuation[fl/ktju’eifen]n.起伏；波动regulate[rejuleit]vt.调节、规定；控制；校准；有系统的管理terminologyn.术语；术语学；用辞；专业术语；专有名词lizard[‘lized]n.蜥蜴；类蜥蜴爬行动物iguana[I’g

8、wa:ne]n.鬣蜥蜴desertiguana沙漠蜥蜴homeothermsn.恒温动物poikilothermsn.变温动物；冷血动物hibernation[haibe’neifen]n.冬眠；过冬invertebra