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.
答案是B,不理解阿，请大家指点指点
It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
这句话的意思是，距离因为实行禁令而导致狩猎时间缩短的时代已经有好几年了，意味着，近几年，该禁令实际上是名存实亡的状态，因此废不废除都不会对雪鹅的数量产生什么大的影响，从而削弱。
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