【逻辑精选25练】GMAT官方CR真题实例讲解（第三练）
- 2015年07月02日17:04 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：
Parland’s alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers of these fish available for human consumption. Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.
Which of the following, if true, most helps to explain the decline in the population of the fish species?
(A) The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.
(B) Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.
(C) The main predator of these fish is another species of fish on which alligators also prey.
(D) Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.
(E) In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.
题目类型：
explain
题目翻译：
P地的短吻鳄数量近年因为捕猎而逐年下降。这种短吻鳄以一种淡水鱼为主要食物，而这种淡水鱼同样也是P地居民的主要食物。居民们希望短吻鳄数量的下降可以让供人类食用的淡水鱼的数量有所提升，但是却意外地发现，即使人类的捕捞没有增加，淡水鱼的数量仍然下降了。问下列哪一项可以解释这种现象。
解题思路：
找到可以让淡水鱼数量下降的其他原因。
逐项分析：
A、人们可以在以前觉得太危险的地方捕鱼了，可能会增加对淡水鱼的捕鱼量，但这与题干相矛盾。
B、渔业公司增加了捕鱼船的数量，可能会增加对淡水鱼的捕鱼量，但这与题干相矛盾。
C、正确选项。淡水鱼的主要捕食者是短吻鳄的食物。因为短吻鳄数量的下降，可能导致这种捕食者的数量上升，从而导致淡水鱼的数量下降。
D、许多P地的人捕杀短吻鳄是因为鳄鱼皮，与淡水鱼无关。无关项。
E、无关项。P的邻国的情况与P无关。
正确选项：
C
