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所谓SAT阅读长难句，是指有复杂修饰成分，大量的插入语和同位语，句子中有倒装或者省略;用到了文学上的修辞手法，典故等;还有就是细节描写比较多，并列句，平行结构比较多。这就造成了大家在做SAT阅读题的时候理解文章非常困难。下面我们来学习5个SAT阅读长难句。 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，most geologists 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。难句类型：复杂修饰、插入语 2. 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. | 
