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托福阅读绊脚石之语言要素

2015-08-06 17:45:19来源：网络

　　怎样才能有助于托福写作能力的提高？新东方在线托福网为大家带来托福阅读绊脚石之语言要素，希望对大家托福备考有所帮助。更多精彩尽请关注新东方在线托福网!

　　提炼一个文章的哪些“语言要素”除了有助于我们在阅读中游刃有余，也有助于托福写作能力的提高。

　　托福阅读例子原文：

　　Geologists have long known that the Earth's mantle is heterogeneous， but its spatial arrangement remains unresolved—is 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" (elements tending toward liquid rather than solid state) 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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