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1、XadVb小马过河国际教育Xw.xiaomaxomIHiaomaInternationa—eoucatzionGRE阅读能力的培养小马过河为大家准备了“GRE阅读能力的培养”，供各位备考GRE的考生们参考使用，来提高白己的托福成绩！免费咨询电话：400-0123-267N08-1,我们从“词一句一篇章”來谈谈这篇文章。原文：GeologistshavelongknownthattheEarth'snumtieisheterogeneous,butitsspatialarrangementremainsunresolved—isth
2、emantleessentiallylayeredorirregularlyheterogeneous?Thebestevidenceforthelayered-mantlethesisisthewell-establishedfactthatvolcanicrocksfoundonoceanicislands,islandsbelievedtoresultfrommantleplumesarisingfromthelowermantle,arecomposedofmaterialfundamentallydifferentfro
3、mthatofthemidoceanridgesystem,whosesource,mostgeologistscontend,istheuppermantle.Somegeologists,howeveronthebasisofobservationsconcerningmantlexenoliths,arguethatthemantleisnotlayered,butthatheterogeneityiscreatedbyfluidsrichin“incompatibleelementsn(elementstendingtow
4、ardliquidratherthansolidstate)percolatingupwardandtransformingportionsoftheuppermantleirregularly^accordingtothevagariesofthefluids'pathways・Webelieve,perhapsunimaginatively,thatthisdebatecanberesolvedthroughfurtherstudy,andthattheunderexploredinidoceanridgesystemisth
5、ekey.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.—部分二、难句1・thebestevidenceforthelayered-mantlethesisisthewell-establishedfactthatvolcanicrocksfoundonoceanicislands,islandsbelievedtoresultfrommantleplumesari
6、singfromthelowermantle,arecomposedofmaterialfundamentallydifferentfromthatofthemid-oceanridgeXadVb小马过河国际教育Xw.xiaomaxomIHiaomaInternationa—eoucatzionGRE阅读能力的培养小马过河为大家准备了“GRE阅读能力的培养”，供各位备考GRE的考生们参考使用，来提高白己的托福成绩！免费咨询电话：400-0123-267N08-1,我们从“词一句一篇章”來谈谈这篇文章。原文：Geologistsha
7、velongknownthattheEarth'snumtieisheterogeneous,butitsspatialarrangementremainsunresolved—isthemantleessentiallylayeredorirregularlyheterogeneous?Thebestevidenceforthelayered-mantlethesisisthewell-establishedfactthatvolcanicrocksfoundonoceanicislands,islandsbelievedtor
8、esultfrommantleplumesarisingfromthelowermantle,arecomposedofmaterialfundamentallydifferentfromthatofthemidoceanridgesystem,w
