求助GWD TN 24一道逻辑题（为什么选D啊）

harvard2012 · 发表于 2011-6-11 13:48:12

Q18: TTGWD11-Q40:

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/D

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.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.

D.During Parland’s dry season, holes dug by alligators remain filled with water long enough to provide a safe place for the eggs of this fish species to hatch.

E.In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.

sdcar2010 · 发表于 2011-6-11 19:55:49

D) explains why the decline in alligators would lead to a decrease in the population of the prey fish since fewer alligators --> fewer holes dug by alligator --> fewer safe haven for the fish eggs --> fewer fish.

harvard2012 · 发表于 2011-6-11 21:19:59

thanks

大宝店小二 · 发表于 2012-4-18 12:22:39

B如何解释呢？

求助GWD TN 24一道逻辑题（为什么选D啊）

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求助GWD TN 24一道逻辑题 （为什么选D啊 ）

所属分类: GMAT考试

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求助GWD TN 24一道逻辑题（为什么选D啊）