2012新GRE阅读题型之细节题全攻略（6）
罗马数字题
罗马数字题是GRE阅读中出现比较多的一种题型，通常情况，考试的题型中定会有一道或两道这类题型。虽然，出题的数目不是很多，但是也要特别注意。罗马数字题主要考查考生对文章的理解以及一些逻辑推理能力。在对文章的时候要对一些例子、解释等特别关注，要在文中做好标记，以便迅速地找到答案。
罗马数字题题的基本结构：
The author provides following which of the following examples in the passage?
1．Ⅰ only
2．Ⅱ only
3．Ⅲ only
4．Ⅰ & Ⅱ
5．Ⅱ & Ⅲ
当遇到罗马数字题时，首先回原文找列举，没有列举再继续看题做答。做大多数罗马数字题有捷径可走的，考生应该在看完选项后先看备选答案。比如，几个备选答案都有Ⅰ，则Ⅰ肯定是正确的，就不必再判断了。
下面举一个具体的例子：
The recent, apparently successful, prediction by mathematical models of an appearance of El Nino—the warm ocean current that periodically develops along the Pacific coast of South America—has excited researchers……
It has long been known that during an El Nino, two conditions exist: (1) unusually warm water extends along the eastern Pacific, principally along the coasts of Ecuador and Peru, and (2) winds blow from the west into the warmer air rising over the warm water in the east．These winds tend to create a feedback mechanism by driving the warmer surface water into a “pile” that blocks the normal upwelling of deeper, cold water in the east and further warms the eastern water, thus strengthening the wind still more．The contribution of the model is to show that the winds of an El Nino, which raise sea level in the east, simultaneously send a signal to the west lowering sea level．According to the model, that signal is generated as a negative Rossby wave, a wave of depressed, or negative, sea level, that moves westward parallel to the equator at 25 to 85 kilometers per day．Taking months to traverse the Pacific, Rossby waves march to the western boundary of the Pacific basin, which is modeled as a smooth wall but in reality consists of quite irregular island chains, such as the Philippines and Indonesia．考试用书
……
无论做什么题，我们在对完文章后，都要清楚一个基本的问题，就是文章的结构和行文思路。这篇文章属于结论解释型文章，作者在第一段的第一句话就提出了结论，后面所以内容都是对这个结论的解释说明。所以，文章的首句是全文的中心句（topic sentence）。
It can be inferred from the passage that which of the following would result fairly immediately from the cessation of the winds of an El Nino?
I．Negative Rossby waves would cease to be generated in the eastern Pacific．
II． The sea level in the eastern Pacific would fall．
III． The surface water in the eastern Pacific would again be cooled by being mixed with deep water．
(A) I only
(B) II only
(C) I and II only
(D) I and III only
(E) I, II, and III