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标题: 逻辑逻辑 [打印本页]

作者: Spencer125 时间: 2013-5-10 18:49
标题: 逻辑逻辑

In1992 outlaw fishing boats began illegally harvesting lobsters from the territorialwaters of the country of Belukia. Soon after, the annual tonnage of lobsterlegally harvested in Belukian waters began declining; in 1996, despite therebeing no reduction in the level of legal lobster fishing activity, the localcatch was 9,000 tons below pre-1992 levels. It is therefore highly likely thatthe outlaw fishing boats harvested about 9,000 tons of lobster illegally thatyear.

Whichof the following is an assumption on which the argument depends? a

A. The illegal lobster harvesting was not so extensive thatthe population of catchable lobsters in Belukia’s territorial waters hadsharply declined by 1996

B. The average annual lobster catch, in tons, of an outlawfishing boat is has increased steadily since 1992.

C. Outlaw fishing boats do not, as a group, harvest morelobsters than do licensed lobster-fishing boats.

D. The annual legal lobster harvest in Belukia in 1996 was notsignificantly less than 9,000 tons.

E. A significant proportion of Belukia’s operators of licensedlobster-fishing boats were out of business between 1992 and 1996

答案是A，为什么？

作者: Apolloemma 时间: 2013-5-10 22:50
只有在保证 1992年-1996年，每年的捕捞量是没有变化的情况下，才能推出正规渠道下降的捕捞量都被非正规渠道的捕捞弄走了。

作者: 陶星儿 时间: 2013-7-9 09:25
结论合法捕捞减少了9000吨是因为非法捕捞增加了9000吨。
总量没有巨大变化才有可比性

Assumption 题正确答案取非可以削弱原结论
A 取非得到：总量下降了。削弱了原结论------分析：合法捕捞减少了9000吨有可能是因为总量下降引起的，而不是因为非法捕捞。

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