教你分析GRE閱讀文章篇章結(jié)構(gòu)

　　教你分析GRE閱讀文章篇章結(jié)構(gòu)

　　從詞、句、結(jié)構(gòu)的角度GRE閱讀段是最有效也是最有收獲的.一種方式，有利于大家增強(qiáng)長難句的分析能力，積累詞匯，寫作素材以及作文結(jié)構(gòu)構(gòu)架方法。下面我們就拿GRE閱讀NO題的NO8-1這篇文章做一個(gè)示范，來說明一下除了我們做對(duì)每一個(gè)閱讀選擇題以外，我們應(yīng)該從閱讀文章中獲得些什么資源，提煉一個(gè)文章的哪些語言要素有助于英語能力的提高。

　　我們從詞--句--篇章來談?wù)勥@篇文章。

　　原文：

　　Geologists have long known that the Earths mantle is heterogeneous， but its spatial arrangement remains unresolvedis the mantle essentially layered or irregularly heterogeneous? The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands， islands believed to result from mantle plumes arising from the lower mantle，are composed of material fundamentally different from that of the midocean ridge system， whose source， most geologists contend， is the upper mantle.Some geologists， however， on the basis of observations concerning mantle xenoliths， argue that the mantle is not layered， but that heterogeneity is created by fluids rich in incompatible elements percolating upward and transforming portions of the upper mantle irregularly， according to the vagaries of the fluids pathways. We believe， perhaps unimaginatively， that this debate can be resolved through further study， and that the underexplored midocean ridge system is the key.

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