【逻辑精选25练】GMAT官方CR真题实例讲解（十四练）

2015年07月07日16:12 来源：小站整理

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GMAT逻辑题一直以来是不少考生的弱项，因为逻辑题考查的不只是考生对于英文题目的阅读和理解能力。考生必须具备一定的逻辑推理思维能力才能做好此类题目。下面小编就通过一些GMAT逻辑真题的完整分析来为大家讲解这一难点题型的解题思路和技巧。

例题分享：

Maize contains the vitamin niacin, but not in a form the body can absorb. Pellagra is a disease that results from niacin deficiency. When maize was introduced into southern Europe from the Americas in the eighteenth century, it quickly became a dietary staple, and many Europeans who came to subsist primarily on maize developed pellagra. Pellagra was virtually unknown at that time in the Americas, however, even among people who subsisted primarily on maize.

Which of the following, if true, most helps to explain the contrasting incidence of pellagra described above?

(A) Once introduced into southern Europe, maize became popular with landowners because of its high yields relative to other cereal crops.

(B) Maize grown in the Americas contained more niacin than maize grown in Europe did.

(C) Traditional ways of preparing maize in the Americas convert maize’s niacin into a nutritionally useful form.

(D) In southern Europe many of the people who consumed maize also ate niacin-rich foods.

(E) Before the discovery of pellagra’s link with niacin, it was widely believed that the disease was an infection that could be transmitted from person to person.

题目类型：

explain

题目翻译：

玉米富含维生素N，但是是以一种人类无法吸收的形式存在的。P是一种N不足导致的疾病。当玉米从美国传到欧洲后，很快就成为了人们的主食，很多欧洲人也因为食用玉米而得了P病。但是，P病在美国几乎没有人知道，甚至是在以玉米为主食的人中。问哪一项可以解释P病在欧洲和美国的不同情况。

解题思路：

既然吃的东西是一样的，一定有其他什么不一样的东西导致了这样不同的情况。

逐项分析：

A、无法解释为何美国人没有P病。

B、同A。

C、正确选项。烹调方法就是“解题思路”里说的“其他什么不一样的东西”。

D、如果这样的话，应该是欧洲人没有P病，美国人有P病才对。

E、在发行P病和维生素N的关系之前，人们普遍认为P病是可以在人与人之间传染的。无关项。

正确选项：

C