文章首句指出:由于地震反射法在勾划地球的地下层面这方面的准确性,该方法一直是探寻石油储备的最重要的工具。这是一个判断句,为结论。其中remains为系动词,而most important为态度词,表示作者对地震反射法持非常正面的评价。后文应解释地震反射法的具体过程。 第二句话对解释进行总的说明:在实地作业中,通过将一系列波列源,诸如小规模炸药爆炸,排列成一个网格模式,从而将地下层面标绘出来。接下来是地震反射法的详细过程。
2. 新老观点对比型
GRE阅读文章的第二种常见结构是新老观点对比型。 这类文章在开始提出老观点,然后提出新观点并进行论述。通常新观点是文章的主题。老观点出现的标志词有:
1. 传统观点: has been, traditionally, until recently等
2. 大众观点:frequently, widely, many等
新观点出现的标志词有:however, recently, now等。
例如,
Traditionally, pollination by wind has been viewed as a reproductive process marked by random events in which the vagaries of the wind are compensated for by the generation of vast quantities of pollen, so that the ultimate production of new seeds is assured at the expense of producing much more pollen than is actually used.
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