国际顶尖MBA申请交流平台--TOPWAY MBA

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.

A. Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.

B. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.

C. The number of snow geese taken by hunters each year has grown every year for several years.

D. As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.

E. In the snow goose’s winter habitats, the goose faces no significant natural predation.

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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

大概意思是说虽然SG在南方过冬的地方是狩猎取，但当狩猎到的SG达到总数5%后狩猎季节就停止。

It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.

意思是说自最后一次狩猎期提前结束（也就是说捕杀到足够SG的时候）的日期以来，已经很多年没有再提前结束了。这说法其实就是间接告诉你SG这几年的捕杀量一直都没达到5%限制，所以就算降低限制也没有用，削弱了结论

所以B选项是正确的

C和D都是迷惑选项，C每年捕杀的SG都增加，降低限制后捕杀的SG仍然可以增加，甚至增加更多，加强了结论

D开拓了新的栖息地，并不意味这猎人捕杀的数量就减少，因为没有ASSUMPTION说明猎人不可以捕杀新栖息地的SG，与结论无关

这道题小心不要把B选项理解错意思就不难做了

it has been many years that... 连续好几年都。。。。（如果这样就是支持）

it has been many years since....自。。。以来，好几年没有这样了（如果这样就是虚弱）