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?
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.
为什么选B呢？
题目中的where they winter,中的winter是动词“过冬”的意思。
我试着解释一下：文章的意思是restriction要求当打猎使snow geese的数量下降5%的时候，就要停止打猎。而如果取消restriction,理想当中，猎人会打更多的snow geese,从而保护了其他的birds.
B的意思是：长时间以来，有restriction的存在，但打猎比规定的时间停止的要早。这里暗含了什么意思呢？就是说猎人还没有将snow geese 的数量减少5%，就自动放弃了打猎，这是猎人的自发行为，甚至比restriction的要求做的更好。那么也就是说即使没有了restriction,由于猎人的自发行为，猎人并不会打更多的geese。所以削弱
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