初三英语听力练习资料归纳.docx

初三英语听力练习资料归纳初三英语听力：鸟类并不笨头笨脑Neuroscientists'opinionsaboutthebrainsofbirdshavechanged.神经系统科学家关于鸟类大脑的传统观念发生了转变。Inhumansandothermammals,theroofoftheforebrainhasevolvedintothecerebralcortex,astructureresponsibleforflexiblelearningandreasoning.人类和其他哺乳动物的前脑顶层已经进化为大脑皮层，这一结构主管弹性学习和推理能力。Earlyneuroanatomiststhoughtthattheforebrainroofwassmallandsimpleinbirds,withitsforebraininsteadbeingdominatedbystructuresinitsbase,calledthebasalganglia.早期的神经系统科学家认为鸟类的前脑顶层在大脑中面积小，构造简单，且并非由大脑基底部名为基底神经节的结构组成。Withoutanelaborateforebrainroof,itseemedthatbirdscouldn'tbeverysmart.因此，鸟类并不拥有复杂精妙的前脑顶层，这似乎决定了鸟类智商有限。Recentresearchshowsthatbirdsarealotsmarterthanscientistsoncethought.最近的研究表明鸟类要比科学家想象的聪明得多。Togivejustafewexamples,theNewCaledoniancrowcanmanufactureandusetools.例如，新喀里多尼亚乌鸦会制作和使用工具。TheAfricangreyparrotcanlearntoclassifyobjectsintocategories,andtheFloridascrubjaystoresfoodindozensofcachesandcanremembertheirlocationsforfutureuse.非洲灰鹦鹉能学会对东西进行分类，佛罗里达灌丛鸦会将食物存储在不同的地方，并且能记住位置，以备将来之需。Itturnsoutthatneuroanatomistshaditallwrongaboutbirdforebrains.结果是神经解剖学家对鸟类前脑的研究完全错误。Duringmorethan300millionyearsofseparateevolution,theforebrainroofsofbirdsandofmammalseachgrewlargerandmoreelaborate,butindifferentways.初三英语听力：Airplanes-飞机Airplanesareamazing.Howdoessomethingsobigandheavygetofftheground?I’malwaysamazedathowthemillionsofdifferentpartsworktogether.Travellingbyairplaneisalwaysawonderfulexperience.Idon’tcarewhethereconomyclassiscrampedandhasnospace.Ilikeplayingwiththein-flightentertainmentsystem,especiallynowtheyhaveallthelatestmovies.Ialsoloveairplanefood.Manyofmyfriendssayit’sdisgusting,butIloveit.IoftenaskthepassengernexttomeifIcanhavethedessertorrolltheydon’twant.TheonlythingIdon’tlikeaboutplanesisturbulence.Whentheairplanehitsthoseairpockets,Ialwaysworrywe’llcrash.ButIoncereadthatturbulencehasnevercausedanairplanetocrash.初三英语听力：脂肪储存的来龙去脉Whenyoueatafattyfood,itmovesthroughthestomachandontotheintestines.当你食用富含高脂肪的食物时，脂肪通过胃流入肠道。Intheintestines,anumberofprocessesoccurtotransferfatfromthefoodtospecialfatcellsi