gwd11-40

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?

1. The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.
2. Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.
3. 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.
4. 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.
5. In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.

   Answer: d 為什麼a不可以阿??

a?当然不可以阿,A说alligator的减少使得鱼类可以在以前很危险的地方活动...那么?你觉得这个helps to explain the decline in the population of the fish species？

至于D,自然而然嘛..alligator的baby们在先前dig的很safe的hole里继续成长,自然因为这些家伙的存在鱼类还是要被他们吃掉嘛

在危險的地方活動不會使他們死掉嗎??

答案D:

在parland的干旱季节，alligators打的洞中仍保持有水分，使eggs of  fish

      能够在洞中安全度过干旱季节； 现在alligators被捕杀后，使得fish也难以    度过干旱季节，因此导致fish的数量也下降了。

（破坏了生态平衡嘛@_@）

不对把，选项A人家说得是fisher 可以在其他地方钓鱼，这样应该降低鱼量， 不过这个选项也不合适， 我记得gre中有个类似的， 他因是钓鱼爱好者-他们钓鱼不是为了吃，仅仅为了消遣，这样就能解释情况了。

D选项怎么能降低数量呢， 有点反过类增加的可能啊。

这个又带上推理了， 难道fish egg 就靠这个来度过旱季？

这个文中需要给出前提吧。

总之这个题目有问题。 

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.

首先，文章已经说了，人类每年捕鱼的数量没有大幅增加，所以A和B都排除，因为A说人类捕鱼范围扩大而B说的是人类捕鱼效率提高，C是人们捕捉鳄鱼的原因，无关也排除，E说邻国怎样，也排除，就只剩D了

也可以这么想，为什么鳄鱼少了，它吃的鱼不但没多，反而也少了呢？4个选项里面，只有D说了鳄鱼在这种鱼的繁衍中起的作用，就是鳄鱼挖洞，鱼就在那些洞里孵化，所以鳄鱼少了，没有人挖洞了，那些鱼也就少了。

不对吧

D中说to provide a safe place for the eggs of this fish，就是说那些鱼卵现在有个不错的地方可以孵化，那么他们的数量不是应该增加才对吗，为什么会减少呢？

alligator少了，可供鱼孵化的条件也少了，鱼自然就少了