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。
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。
However, a number of features that are characteristic of wind-pollinated plants reduce pollen waste
文章首句指出:传统上,风媒授粉过程一直被视为是一个以随机事件为标志的繁殖过程,其中风的不确定性通过产生大量花粉而得以补偿,因此,新种子的最终繁殖得以保证,而此举的代价是所需产生的花粉要远远超过实际的使用量。由第一个词traditionally可知文章首句为老观点,那么本文的结构是新老观点对比型。
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