一道无法找出答案的题，麻烦讲讲

helenwolf · 发表于 2009-4-27 00:51:00

Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species. Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates. Clearly, dropping this restriction would allow the other species to recover.

Which of the following, if true, most seriously undermines the argument?

Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.
It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
The number of snow geese taken by hunters each year has grown every year for several years.
As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
In the snow goose’s winter habitats, the goose faces no significant natural predation.

B究竟是如果削弱的，？麻烦解释。谢谢！！

lollypp · 发表于 2009-4-27 11:30:00

因为文中推出的依据是： the hunting season ends if and when hunting has reduced the population by five percent, 也就是说如果捕杀snow geese导致数量下降5%时，捕杀要停止。B中说多年来捕杀停止的时间要早于计划的时间，因为数量下降了5%时才停止，现在还没达到这个时候数量就已经少于5%了，即snow geese的数量少到即使政府不颁布停止捕杀这个限制也不会变多。所以削弱：snow geese已经很少了，即使大量捕杀snow geese，也不会导致other species to recover.

helenwolf · 发表于 2009-4-27 21:59:00

文章说的应该是下降了5%吧，不是下降到5%

auflute · 发表于 2009-4-27 22:51:00

这道题怪怪的

一道无法找出答案的题，麻烦讲讲

一道无法找出答案的题，麻烦讲讲

所属分类: GMAT考试

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