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1、智课网GMAT备考资料名师指导：如何提高GMAT阅读能力一直以来，如何提高GMAT阅读能力困扰了很多GMAT考生，如何才能短时间内写出完成GMAT阅读并取得高分呢?今天我们针对这一问题特地请教了智课教育GMAT方面的老师，老师为我们选了一篇已考GMAT阅读文章，从“词--句--篇章”来谈谈这篇文章。●●点击获取更多专业名师一对一咨询、免费网上增值服务●●原文：GeologistshavelongknownthattheEarth'smantleisheterogeneous,butitsspatialarrangem
2、entremainsunresolved—isthemantleessentiallylayeredorirregularlyheterogeneous?Thebestevidenceforthelayered-mantlethesisisthewell-establishedfactthatvolcanicrocksfoundonoceanicislands,islandsbelievedtoresultfrommantleplumesarisingfromthelowermantle,arecomposedofm
3、aterialfundamentallydifferentfromthatofthemidoceanridgesystem,whosesource,mostgeologistscontend,istheuppermantle.Somegeologists,however,onthebasisofobservationsconcerningmantlexenoliths,arguethatthemantleisnotlayered,butthatheterogeneityiscreatedbyfluidsrichin"
4、incompatibleelements"(elementstendingtowardliquidratherthansolidstate)percolatingupwardandtransformingportionsoftheuppermantleirregularly,accordingtothevagariesofthefluids'pathways.Webelieve,perhapsunimaginatively,thatthisdebatecanberesolvedthroughfurtherstudy,
5、andthattheunderexploredmidoceanridgesystemisthekey.一、难词spatial:a.1.空间的，太空的;2.存在(或者发生)于宇宙空间的plume:n.1.羽状物2.柱，地柱xenolith:俘虏岩percolate:v.1.渗透2.扩散到，弥漫于portions:n.一部分二、难句1.thebestevidenceforthelayered-mantlethesisisthewell-establishedfactthatvolcanicrocksfoundonocea
6、nicislands，islandsbelievedtoresultfrommantleplumesarisingfromthelowermantle，arecomposedofmaterialfundamentallydifferentfromthatofthemid-oceanridgesystem，whosesource，mostgeologistscontend，istheuppermantle.(5-)对于地幔分层论点来说，最好的证据乃这样一个确认的事实，即在那些海洋岛屿——这些岛屿据信是源于由下层地幔升上
7、来的地幔柱状溶岩流(mantleplume)——上发现的火山岩石，是由与海洋中部山脊系统的物质根本不同的物质构成的，而这一海洋中部山脊系统的成因，大多数地质学家论辩道，为上部地幔。难句类型：复杂修饰、插入语解释：本句前面的主干并不算难，即theevidenceisthefactthat,难就难在fact之后说明fact的同位语从句。此从句中既有大段插入语，又有从句，较为难读。同位语从句的主语是volcanicrocks，主语后面的foundonoceanicislands是分词修饰volcanicrocks的;isl
8、ands后面又有一个说明islands的同位语islandsbelievedtoresultfrommantleplumesarisingfromthelowermantle,此同位语实际起到一个分隔主谓的同位语的作用。其后是谓语动词arecomposed/offundamentallydifferentfromthatofthemidocea
