分析GRE阅读中的难句难词

　　NO8-1，我们从“词--句--篇章”来谈谈这篇文章。

　　原文：

　　Geologists¹ have long known that the Earth‘s mantle² is heterogeneous³， but its spatial⁴ arrangement remains⁵ unresolved-is the mantle essentially⁶ layered or irregularly heterogeneous? The best evidence for the layered-mantle thesis is the well-established fact that volcanic⁷ rocks found on oceanic islands， islands believed to result from mantle plumes⁸ arising from the lower mantle，are composed of material fundamentally different from that of the midocean ridge⁹ 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 heterogeneity¹⁰ is created by fluids rich in “incompatible elements” (elements tending toward liquid rather than solid state) percolating¹¹ upward and transforming portions of the upper mantle irregularly， accordingto the vagaries¹² 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.

　　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.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 mid-ocean ridge system， whose source，mostgeologists contend，is the upper mantle.

　　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来的地幔柱状溶岩流(mantle plume)--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。

　　以上对于新GRE阅读理解解析，就能看出我们分析一篇GRE阅读理解文章时候，需要作出那些准备以及利用什么方向进行GRE阅读理解。希望考生们取得理想的成绩，实现梦想。

 

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