【快讯】2013年3月16日托福阅览真题回忆及解析

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以下是在年3月16日的托福[微博]考试中阅读真题的回忆和解析，供各位考生参考，希望对大家有帮助！

通过话题应对，可以点结合tpo11 orientation and navigation。 tpo15 a warm-blooded turtle； tpo16 planets in our solar system的3篇复制阅览。

1、如何计算太阳系的年龄

如何计算地球的年龄，地球表面在水和风华的作用下影响底层，很难推测，但通过研究meteor三种可以作为rocky、irony、rocky-irony。 介绍了他们的来源，大部分是分裂的大型陨石。

据推测地球形成于大约64million年前左右，科学家们发现月球meteor就是这个时间。 月球表面不是风华，所以这个时间应该是正确的。

最后，通过检测从其他行星发送来的wavelight的波长，推测宇宙膨胀，银河间的距离变远。

age of the earth

sofarscientistshavenotfoundawaytodeterminetheexactageoftheearthdirectlyfromearthrocksbecauseearth ' soldestrockshavebeneclycal DD fplatetectonics.ifthereareanyofearth ' sprimordialrocksleftintheiroriginalstate，theyhavenotyetbeenfound.nevertheless， scientistshavebeenabletodeterminetheprobableageofthesolarsystemandtocalculateanagefortheearthbyassumingthattheearthandthethehes estofthesolidbodiesinthesolarsystemformedatthesametimeandare，therefore，of the same age。

theagesofearthandmoonrocksandofmeteoritesaremeasuredbythedecayoflong-livedradioactiveisotopesofelementsthatoccurnaturalin ksann halflivesof 700 milliontomorethan 100 billionyearstostableisotopesofotherelements.thesedatingthingching。 ues，whicharefirmlygroundedinphysicsandareknowncollectivelyasradiometricdating， areusedtomeasurethelasttimethattherockbeingdatedwaseithermeltedordisturbedsufficientlytorehomogenizeitsradioactivelements。

ancientrocksexceeding 3.5 billionyearsinagearefoundonallofearth ' scontinents.theoldestrocksonearthfoundsofararetheacastagnise inn tslavelake ( 4.03 GA ) Andtheisuasupracrustalrocksinwestgreenland ( 3.7 TO 3.8 GA )， but well-studiedrocksnearlyasoldarealsofoundintheminnesotarivervalleyandnorthernmichigan ( 3.5-3.7 billion years )是inswaziland andinwesternaustralia ( 3.4-3.6 billion years ).[ see editor ' snote.] theseancientrockshavebeendatedbyanumberofradiometricdatingmethodsandtheconsistencyoftheresultsgivescientistsconfidencethathatha ( theseancientrockshocks gesarecorrecttowithinafewpercent.aninterestingfeatureoftheseancientrocksisthattheyarenotfromanysortof ) aflowsandsedimentsdepositedinshallowwater，anindicationthatearthistorybeganwellbeforetheserocksweredeposited.inwesternaustra singlezirconcrystalsfoundinyoungersedimentaryrockshaveradiometricagesofasmuchas 4.3 billion years， makingthesetinycrystalstheoldestmaterialstobefoundonearthsofar.the sourcerocksforthesezirconcrystalshavenotyetbeenfound.the。 gesmeasuredforearth ' soldestrocksandoldestcrystalsshowtheearthisatleast 4.3 billionyearsinagebutdonotrevealtheexactageof arth rtheearth(4.54ga)isbasedonold、presumed single-stageleadscoupledwithepbrationintroilitefromironmeteorites， specificallythecanyondiablometeorite.in dition mineral grains ( zircon ) withu-pbagesof 4.4 gahaverecentlybeenreportedfromsedfromsedimentaryrocksinwest-central Australia.themoonisamoreprimitiveplanethan beca thus，someofitsmoreancientrocksaremoreplentiful.onlyasmallnumberofrockswereturnedtoearthbythesixapolloandthreelunamisions.on e rocks vary greatly in age，areflectionoftheirdifferentagesofformationandtheirsubsequenthistories.theoldestdatedmonrocks， whow haveagesbetween 4.4 and 4.5 billionyearsandprovideaminimumagefortheformationofournearestplanetaryneighbor.thousandsofmeteriter roidsthatfalltoearth，have been recovered.theseprimitiveobjectsprovidethebestagesforthetimeofformationofthesolarsystem.there are of different types，whoseageshavebeenmeasuredusingradiometricdatingtechniques.theresultshowthatthemeteorites， and therefore the solar system， formed between 4.53 and 4.58 billion years ago.thebestagefortheearthcomesnotfromdatinginpidualrocksbutbyconsideringtheearthandmet e lvingsysteminwhichtheisotopiccompositionoflead， specificallytheratiooflead-207 tolead-206 changesovertimeowingtothedecayofradioactiveuranium-235 and uranium-238， respectively.scientistshaveusedthisapproachtodeterminethetimerequiredfortheisotopesintheearth ' soldestleadores，of which there a toevolvefromitsprimordialcomposition，asmeasuredinuranium-freephasesofironmeteorites， toitscompositionsatthetimetheseleadoresseparatedfromtheirmantlereservoirs.thesecalculationsresultinangefortheearthandmetor es， and hence the solar system，of 4.54 billionyearswithanuncertaintyoflessthan1Percent.tobe Precise， thisagerepresentsthelasttimethatleadisotopeswerehomogeneousthrougouttheinnersolarsystemandthetimethatleadanduraniumwasincorpor ndwandwasincorpor ) ( thim atedintothesolidbodiesofthesolarsystem.thea geof 4.54 billionyearsfoundforthesolarsystemandearthisconsistentwithcurrentcalu 是yearsfortheageofthemilkywaygalaxy ( basedonthestageofevolutionofglobularclusterstars )。 andtheageof 10 to 15 billionyearsfortheageoftheuniverse ( basedontherecessionofdistantgalaxies )。

2、lizard是冷血动物，体温高，需要维持正常的生理生长活动，但他们直接得到周围的热量，不是自己发烧。 然后，论述了这种冷血动物和能自我发热的动物的优缺点。 发烧的动物需要觅食获得热量。 因为容易被天敌发现。 食物不足会导致生长困难，冷血动物可以适应突然的食物和环境变化，低温下会成为inactive，但容易食用。

arelizardswarmbloodedorcoldblooded？

withafewexceptionsallreptilessuchasthelizardarecoldbloodedcreatures.thetemperatureofananimal’s blood ( whetherananimalwares )。 edorcoldblooded ) isrelatedtoitsbodytemperature。

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