一道逻辑，一起讨论下吧

mudiduange

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?

AHunting 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.

sdcar2010

Choose B.

jicdy

应该是c吧

piacia

B，c只是说了数量的关系与题目的政策无关，B的话说明了这个政策实施好久了，但是数量的减少只是最近才发生的，所以应该是驳斥

sdcar2010

The answer is B, which 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. Thus, B weakens the argument.

In other words, what B says is that the 5% reduction in geese population due to hunting has never been reached for many years. Therefore, more than 5% reduction in geese population is unlikely to be reached even if such restriction is removed

lonelyorchid

貌似挺难的，但是可以确定的是A、B、C、E不对，我的理由如下
A 说反了。如果法令是为了防止雪鹅数量下降，那么取消法令就可以使雪鹅数量下降，是北极鸟数量上升
B 这句话的正确翻译应为：直译：自从限制导致雪鹅捕杀季截止于预订时间以前已经很多年了。意译：许多年以来，由于限制，雪鹅捕杀季一直比预订的捕杀季中止时间早。所以仍然是讲限制是有作用的
C 每年被打死的雪鹅数量都在增加，说明 虽然捕杀比例没变，但是雪鹅的总数增加了，说明两点（限制仍然起作用，所以取消限制可以导致捕杀数量的增加）
E 雪鹅没有天敌，说明人为控制雪鹅数量更为重要，所以取消限制可以使雪鹅数量减少

D 由于数量的增加，雪鹅已经开始寻找很久不用的新越冬地点。所以新的越冬地点的使用时的原有越冬地点的雪鹅数量已经不再是雪鹅总数，所以就算全部捕杀旧越冬地点的的雪鹅，也并不能保证雪鹅总数的减少。

个人观点，请尽量讨论。（非常有意思的一道题呀～）

sdcar2010

LS, your translation of B is the opposite.

It has been many years SINCE the last time I visited Beijing in December. This sentence means I have NOT visited Beijing in December for a long time!

mudiduange

SDCAR的解释非常精彩，谢谢

也谢谢大家的讨论，这题应该选B

lonelyorchid

哦……
长知识了。。。原来It is the last time since……是习惯用法，而且还是高中英语……
唉，应该去新东方报个高考英语强化班了

另，如此说来，B就完全正确了