GRE阅读文章结构配例题
上文在第一段最后提出一个问题：“究竟是一些什么样的机制控制着旋转方向，并使左旋的比例为数稀少呢?ァ闭飧鑫侍饩褪且桓鱿窒螅郝菪体中左旋的比例少。有问题就有解答，有现象就有解释。第二段从进化论的角度解释这一现象。但是，GRE阅读文章中一般对进化论的解释持负面评价，所以需要寻找新的解释。第三段否定了进化论的解释。在末段，作者以发育机制(developmental mechanism)解释“为何左旋少、右旋多”。
二、解题技巧
把握了文章的三种主体结构以后，做文章后的许多题时易如反掌。以上述的“结论——解释型”文章为例，如果熟悉文章的主体结构，下面两道题就很容易找到正确答案。
1. The passage is primarily concerned with
(A) describing an important technique
(B) discussing a new method
(C) investigating a controversial procedure
(D) announcing a significant discovery
(E) promoting a novel application
正确答案对应文章首句的主题句。因此(A)为正确答案。
2. Which of the following best describes the organization of the passage?
(A) A method is criticized, and an alternative is suggested.
(B) An illustration is examined, and some errors are exposed.
(C) An assertion is made, and a procedure is outlined.
(D) A series of examples is presented, and a conclusion is drawn.
(E) A hypothesis is advanced, and supporting evidence is supplied.
本文的结构是“结论—解释型”，因此(C)为正确答案。
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