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. 知道答案还是不知怎么解释，请NN帮帮忙！作者: jameshzd 时间: 2011-7-19 10:06
很多年来 the restriction 都比the scheduled date 要提早结束，the scheduled date 只的是：when hunting has reduced the population by five percent。意思是还没要减少到5%的时候，猎人都不打了，那么即使不要这样的scheduled date 的限制，猎人也不会打猎超出5%，那么对snow geese数量的减少无效，那么就不会allow the other species to recover.
明白了