1. Aligator 和某鱼的共存
V1 from donglianglei
吃某个鱼来生存，在这个地方的aligator数目减少拉，按道理鱼的数量应该多，但鱼少了。下面那个可以解释。
我选aligator在地上弄出一些holes, 鱼要在这些holes里生蛋。
V2 from carriemo
也是机经里的一道题，说一island上the population of A的数量减少了，而A是捕鱼为食的，照理说这种鱼的数量应该增加才对，结果却依然减少。问原因。有一个选项有点迷惑的，说因为捕鱼船的数量增加了，我开始觉得很有理但没选。选了那个这些鱼在dry season会在A挖的洞里产卵。
PS: 该题现有答案比较一致啊！
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.
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.
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发表于 2009-8-31 23:23:00
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