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题库 / GMATLA-CR-58
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.
雪雁数量上升会导致其他鸟类数量减少。有一个禁令规定，当猎人捕杀雪雁使它的数量减少5%的时候，提前结束捕杀期。但是现在政府决定取消这个禁令，使其他鸟类的数量恢复。
B. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date. 禁令导致捕杀期提前结束已经过去很多年了，也就是说很多年没有提前结束捕杀期了（禁令没起作用），那么即使取消禁令，情况并不会好转。
C. 猎人捕杀的雪雁数量已经持续上升好几年了。那又如何？就算已经捕杀很多雪雁了，取消禁令可以捕杀更多的雪雁，保护其他鸟类，无法削弱结论。
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