分析GRE阅读中的难句难词

　　现在，我们拿GRE阅读NO题的NO8-1这篇文章做一个示范，来说明一下怎样提高新GRE阅读能力。

　　NO8-1，我们从词--句--篇章来谈谈这篇文章。

　　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， accordingto 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.

　　一、难词

　　spatial： a.1.空间的，太空的;2.存在于宇宙空间的

　　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。