1 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. >>
- It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date. >>
- The number of snow geese taken by hunters each year has grown every year for several years. >>
- As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
- In the snow goose’s winter habitats, the goose faces no significant natural predation
作者提供的答案是B, 但是我怎么看B像是在加强呢?
文章说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。就是说如果SG数量很多很多, 本来规定的期限是5天, 现在由于三天使其降低了5%,所以就不能打了。
如果取消了以后,则虽然降低了5%, 还能再打,就有可能降低10%, 15%, 那么SG数量不是大大下降了????岂不是加强???
怎么看像选D, 因为有其他地方栖息, 你打一个地方不够的。数量不会骤减
晕了, 马上考试, 请NN指点。 |