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【GMAT逻辑CR】8778-OG16

浏览次数:64 日期:2017-05-08 15:44:27
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?

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.


【申友解析】


正确答案是:C


题目:P地鳄鱼数量最近几年一直在下降,主要由于对鳄鱼的猎杀。而鳄鱼喜欢捕食的淡水鱼是P地居民所喜爱的食物,那么P地居民就希望鳄鱼数量的减少能带来淡水鱼数量上升这个结果。但是淡水鱼数量也减少了,还是在当地居民没有增加淡水鱼消费量的情况下。
题干:解释鱼群数量下降这个现象。
分析:显性的EXPLAIN,直接判断是引入他因型正向逻辑。
A选项说鳄鱼数量下降会使得渔民可以在之前危险的地方进行作业,题目中已经排除了人为因素对鱼群数量的影响,不能忽视或者否定原文给定的信息。
B选项说P地的渔业企业增加了捕鱼船的数量,跟A选项问题一样。
C选项说鳄鱼不仅仅吃淡水鱼,同时也吃另一种喜欢捕食淡水鱼的物种,那么鳄鱼数量减少,这里所说的另一种喜欢捕食淡水鱼的物种数量会上升,能够导致淡水鱼数量下降这个结果。正确!
D选项讨论为什么要捕杀鳄鱼,与题目论点无关。
E选项说邻国鳄鱼濒临灭绝,None of our business…

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