【求助】GWD14-Q11

lilydenris

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?



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.

我选的B~貌似正确答案也是B~
但是之间的逻辑关系没有搞清~
Clearly, dropping this restriction would allow the other species to recover.这句话是什么意思？

谢谢大家~~~~

tkcamfan

前提：snow geese 的数量多了就威胁了A那个鸟的一些种类。
     猎人hunt snow geese是有个限制的
结论：只要取消了这个hunt snow geese的限制，snow geese的数量就会减少，进而会使被威胁的A鸟的种类数量恢复。

这个推理里面有个假设，是说猎人对snow geese很有兴趣，如果没有打猎限制，那么猎人就会打更多的snow geese，

削弱：本来在有限制的时候猎人都已经对snow geese没有兴趣，还没打到5%的数量就不打了。那么就算取消了打猎限制，猎人还是不会打更多的snow geese，也就不会使snow geese数量下降。

我的理解

lilydenris

太谢谢了！
之前没有仔细读the hunting season ends if and when hunting has reduced the population by five percent这句话~所以没有理解~

tkcamfan

对B选项还是有些不理解 .It has been many years/ since the restriction /led to the hunting season for snow geese/ being closed earlier than the scheduled date.
是这样断句理解吗？ 那中间 led to 很奇怪呀？