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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.
按照官方的说法，假如是数量减少了5%，那么狩猎就停止。
Which of the following, if true, most seriously undermines the argument?
Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.无关。
It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.自从禁令实行以来，已经很多年雪鹅的狩猎季关闭的比预计的早。这样说明，解除禁令可以让多于5%的雪鹅被杀。支持了结论。
The number of snow geese taken by hunters each year has grown every year for several years.近来每年被杀的雪鹅逐年增加。无关。
As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.随着数量增加，雪鹅重新 启用了好几年没用的栖息地。
In the snow goose’s winter habitats, the goose faces no significant natural predation.冬天雪鹅的栖息地没有天敌。无关。这里讨论的是狩猎跟雪鹅的数量。
觉得d对。因为启用新的栖息地，所以猎人不一定找得到。 | 
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发表于 2006-2-2 00:10:00
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