On the other hand, the theory is implausible because convection does not normally occur along lines, and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean.
【题】The author refers to a conveyor belt in order to
illustrate the effects of convection in the mantle
show how temperature differences depend on the positions of the continents
demonstrate the linear nature of the Mid-Atlantic Ridge
describe the complicated motions made possible by back coupling
account for the rising currents under certain mid-ocean ridges
分析:此题为一道举例作用题。其定位为文章中加粗和划线的句子。但是这四个错误的选项都无一例外地通过利用其它的句子编制而成,即出题机构分别使用文章中标号为 A,B,C和D的内容编制出四个错误的选项。因此,不予选择。考生切忌因为文章别的地方曾经出现过类似的内容而犹豫不决。
综上所述,GRE阅读作为一个成熟的考试产品已经存续了几十年。在其选项编制方面已经沉淀了固定的方法。希望能给广大GRE考生一些帮助!
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