请教一道逻辑题GWD17-Q11

AliciaHao

题目如下：
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.
答案是B,不是很懂，望高手指教

HBS2013

雪鹅数量增加，北极鸟受到威胁。
应该大力捕杀雪鹅来挽救北极鸟。
但是现在的限令说，如果捕杀的雪鹅数量占到了总雪鹅的5％，必须停止捕杀。
所以结论的建议是把限令提高一点，来捕杀更多雪鹅，挽救北极鸟。

减弱的是B
限令提高是个好主意，但是如果最近几年，人们连5％的限令都没有用完，提高限令又有什么作用呢（i.e.减少更多的雪鹅）

安猪

kaikaichen 发表于 2010-9-3 16:06
这个才是正解关键是B是啥意思。B 说 It has been many years since the restriction led to the hunting se ...

同意！               

醒醒Shine

56summer 发表于 2010-6-4 19:38
这题为什么不选D呢？？D说当snowgeese的数量增加了，他们就会recolonized,这样就不会对Arctic birds有威胁 ...

因为没涉及到restriction的情况，无法直接攻击逻辑链。

pavanio

jenny0827 发表于 2010-7-13 11:15
这题为什么不选D呢？？D说当snowgeese的数量增加了，他们就会recolonized,这样就不会对Arctic birds有威 ...

Clearly, dropping this restriction would allow the "other species" to recover

這邊也沒提出說是指北極鳥，指提出方法是要讓其他物種復育
題幹一開頭也只有說SOME 只有部分

ssn_wonder

violetyyx 发表于 2012-5-19 18:11
不明白，B选项的意思不是说提前关闭是restriction “led to”的嘛，那就是说因为5%限额用完了，所以提前关 ...

我做错题的时候也是这样理解的. 13楼是正解, 其实是对since的否定

ssn_wonder

kaikaichen 发表于 2010-9-3 16:06
这个才是正解关键是B是啥意思。B 说 It has been many years since the restriction led to the hunting se ...

re 我就是不理解B在讲啥所以才做错的

hzasian

答案B。A说的是很多年前捕杀雪雁过多导致政府设了禁令。但它没有说现在的情况如何，所以和原文不相关。B是说以前的指标往往在规定日期内提前用完（火力很猛），但是这样的日子已经过去很多年了，也就是说现在至少是在规定时间内用完，甚至有用不完的可能，也就是说即使放开管制，捕获的数量也不会大很多（火力太弱）。本题的关键在于理解since引导的句子的意思。关于since连接的句子，若用的是瞬时性动词，时间从动作开始的那一刻累积，如果用的是持续性动词，则说明时间从该动作持续的状态结束后开始累积，如：It has been many years since the house was built. 房子在很久以前就完工了（was built是一种状态，所以many years是从房屋完工后计算）。
It has been 3 years since he lived/studied in New York. 他不住在纽约/不在纽约学习已经3年了(study, live为持续性状态，所以于动作结束后计时才开始)
I have made a couple of friends since I moved to New York. 我搬到纽约后交了几个朋友。（瞬时性动词，计时从move一开始同时累积。）
若since后跟的持续性动词用了现在完成时，则两个动作同时发生：Jim has not heard from Jenny since she has lived in London. (自从Jenny搬到伦敦起，Jim就没她的消息。)
B的句子从意思上说，restriction led to hunting season closed earlier是一个持续状态，所以可以理解为这个状态已经结束很多年了。

verssy

~~~~~原来B是这个意思~~压根就理解错了啊~~~~弱爆了

消失的五花

B选项没看懂啊~