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,以前也讨论过，但是对于这个思路也没有定论，我看了还是不
明白，有人能帮忙看看吗？谢谢。
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