求助GWD31套里第11套中1个逻辑GWD-11-40

elli123

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.

答案是D我选C。。。。百思不得其解呀。

phoenixfr

C完全没道理呀！Parlanders猎杀 alligators的动机不能解释alligator和freshwater fish同时减少的矛盾呀！

这种解释题说白了就是要把两个看似矛盾方面连在一起来或者是把两个本来相连的东西分开来。

D讲alligator的Hole为freshwater fish的产卵提供了场所，这就是把alligator和freshwater fish联系起来了。alligator 减少了，freshwater fish产卵的地方就减少，于是freshwater fish的产量也就下降了。

chamcham

thx

azure

I am 100% behind phoneixfr.