托福课堂:你能阅读出更多吗?

http://www.youth.cn  2013-12-24 13:31:33  中国青年网

  一篇托福阅读文章,哪些方面是我们值得分析的呢?本文中,我们以一篇阅读文章为例,提取它的难词,难句,复杂的文章结构,说明我们应该从阅读文章中获得些什么资源。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。

  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.

编辑:廖书曼 来源:沪江英语网

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托福课堂:你能阅读出更多吗?
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