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
（1）the local catch was 9,000 tons below pre-1992 levels. 这里的local catch是包括合法捕虾和非法捕虾的数量吗？
（2）It is therefore highly likely that the outlaw fishing boats harvested about 9,000 tons of lobster illegallythat year. 这里的that year 是指1992年呢 还是1996年？？
（3）选项A. The illegal lobster harvesting was not so extensive that the population of catchable lobsters in Belukia’s territorial
waters had sharply declined by
If you negate A, you have "The illegal lobster harvesting was so extensive that the population of catchable lobsters in Belukia’s territorial waters had sharply declined by 1996." If this is true, then the total avaialbe lobsters for both legal and illegal catchers are declined sharply. Therefore the 9000 ton difference between 1996 and 1992 are less likely to be caused by the illegal harvest. The conclusion does not hold. So A is the correct answer.作者: michael_wind 时间: 2011-5-27 06:34
谢谢楼上的~~~ 但是我还有疑问：
（1）the local catch was 9,000 tons below pre-1992 levels. 这里的local catch是包括合法捕虾和非法捕虾的数量吗？
legal only
（2）It is therefore highly likely that the outlaw fishing boats harvested about 9,000 tons of lobster illegallythat year. 这里的that year 是指1992年呢 还是1996年？？
1996
（3）选项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 这句话怎么理解呢？是说非法捕虾的数量没有大增，然后1996年大量下降？？？
非法捕虾的数量没有大增, to cause 1996年 available total amount 大量下降作者: tingting520 时间: 2011-5-28 09:13
Necessary assumption. Use negation.
If you negate A, you have "The illegal lobster harvesting was so extensive that the population of catchable lobsters in Belukia’s territorial waters had sharply declined by 1996." If this is true, then the total avaialbe lobsters for both legal and illegal catchers are declined sharply. Therefore the 9000 ton difference between 1996 and 1992 are less likely to be caused by the illegal harvest. The conclusion does not hold. So A is the correct answer.作者: eeheaven 时间: 2011-5-29 09:13
LS, read carefully. The first sentence of the stimulus says:
In 1992 outlaw fishing boats BEGAN illegally harvesting lobsters from the territorial waters of the country of Belukia
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