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. 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.

题干说fish为什么会减少，答案D 却在说鱼为什么会增加，这个有点搞，请指教。

Wow. This is an very interesting one...

C E are wrong because they are not even related...so it narrows down to A and E

A and B might sound tempting but with the original paragraph already stating that "the annual number caught...has not increased," , they could not stand either

For D, my guess is that the relationship between Alligator and the fish are a two-fold. On one hand alli predates fish , on the other hand the hole alli dig provides a safe reproduction place for fish. So when alli are gone, there are no holes left for fish to lay eggs, so the population of fish also declines

Open to discussion...