. GWD17-Q11: 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?
Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.
BIt has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
CThe number of snow geese taken by hunters each year has grown every year for several years. DAs their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons. EIn the snow goose’s winter habitats, the goose faces no significant natural predation. 这个完全没看懂啊····
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.
B. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date. 由于限令而导致打猎季提前结束，这种现象已经持续很多年了。（说明最近的数量激增和限令没有关系，而是由其他原因所致。）
B. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date
In other words, what B says is that the 5% reduction in geese population due to hunting has never been reached for many years. Since B means hunters could not kill more than 5% of snow geese in a hunting season for many years, more than 5% reduction in geese population is unlikely to be reached even if such restriction is removed.
Thus, answer B claims that the restriction set has no effect on the highest number of geese killed in a hunting season. Therefore, removing the restiction would not lead to more killings of the geese and better chances for the other species to recover. B weakens the argument.
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发表于 2011-3-24 22:05:21
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