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【求助】GWD TN24 一道逻辑!~

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楼主
发表于 2010-2-24 12:02:18 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
T-9-Q19. TS-7-11
In 1992 outlaw fishing boats began illegally harvesting lobsters from the territorial waters of the country of Belukia. Soon after, the annual tonnage of lobster legally harvested in Belukian waters began declining; in 1996, despite there being no reduction in the level of legal lobster fishing activity, the local catch was 9,000 tons below pre-1992 levels. It is therefore highly likely that the outlaw fishing boats harvested about 9,000 tons of lobster illegally that year.
Which of the following is an assumption on which the argument depends?
A.    The illegal lobster harvesting was not so extensive that the population of catchable lobsters in Belukia’s territorial waters had sharply declined by 1996
B.    The average annual lobster catch, in tons, of an outlaw fishing boat is has increased steadily since 1992.
C.    Outlaw fishing boats do not, as a group, harvest more lobsters than do licensed lobster-fishing boats.
D.    The annual legal lobster harvest in Belukia in 1996 was not significantly less than 9,000 tons.
E.     A significant proportion of Belukia’s operators of licensed lobster-fishing boats were out of business between 1992 and 1996





答案选A。我是这样想的,假设是题目成立的必要条件,取非后削弱即为正确选项。而题目如果我没有理解错,应该就是说由于没有法令减少legal fishing,但是1996年的捕鱼数量比1992 年低了9000吨,所以,很有可能是非法的渔船当年捕鱼9000吨。为什么A 取非后能削弱文章?实在不明白,请指教~~
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沙发
发表于 2010-2-24 13:26:08 | 只看该作者

答案是A

assumption逻辑是a-b,但是中间也有c原因也可能导致b,所以c是assumption
放在题目中就是合法的捕鱼活动没有减少,但是捕鱼量减少了,所以这部分减少是因为非法捕鱼的量增多。
但是还有一个原因导致减少,就是非法大量捕鱼使总体产鱼量减少。所以a陈述了,只要不是`。。。`
自然就是assumption
板凳
 楼主| 发表于 2010-2-24 15:38:34 | 只看该作者
assumption逻辑是a-b,但是中间也有c原因也可能导致b,所以c是assumption
放在题目中就是合法的捕鱼活动没有减少,但是捕鱼量减少了,所以这部分减少是因为非法捕鱼的量增多。
但是还有一个原因导致减少,就是非法大量捕鱼使总体产鱼量减少。所以a陈述了,只要不是`。。。`
自然就是assumption
-- by 会员 gmatziyu (2010/2/24 13:26:08)




OK~~明白了!~~不过你说的那个assumption逻辑是a-b,但是中间也有c原因也可能导致b,所以c是assumption

这个是哪里的方法呢
地板
 楼主| 发表于 2010-2-24 15:43:22 | 只看该作者
assumption逻辑是a-b,但是中间也有c原因也可能导致b,所以c是assumption
放在题目中就是合法的捕鱼活动没有减少,但是捕鱼量减少了,所以这部分减少是因为非法捕鱼的量增多。
但是还有一个原因导致减少,就是非法大量捕鱼使总体产鱼量减少。所以a陈述了,只要不是`。。。`
自然就是assumption
-- by 会员 gmatziyu (2010/2/24 13:26:08)





ps .....可不可以帮忙看一下这题~~想了很久都不明白~~~
http://forum.chasedream.com/GMAT_CR/thread-440395-1-1.html

THANK YOU VERY MUCH!~
5#
 楼主| 发表于 2010-3-8 16:30:53 | 只看该作者
此消彼长的前提,总量不变
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