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题库 / Prep2012-CR-62
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?
The illegal lobster harvesting was not so extensive that the population of catchable lobsters in Belukia's territorial waters had sharply declined by 1996.
The average annual lobster catch, in tons, of an outlaw fishing boat has increased since 1992.
Outlaw fishing boats do not, as a group, harvest more lobsters than do licensed lobster-fishing boats.
The annual legal lobster harvest in Belukia in 1996 was not significantly less than 9,000 tons.
A significant proportion of Belukia's operators of licensed lobster-fishing boats went out of business between 1992 and 1996.
文中说因为96年比92年少捕了9000吨鱼，所以就得出结论是非法捕鱼走了9000吨。这明显是建立在了一个总鱼数量不变的前提下, 如果总鱼数都减少了的话，不就不能支持那9000是被非法捕走。
A 说并没有因为大量非法捕捞而导致总鱼数量减少，---这就奠定了一个数量不变的基础，正确。
如果鱼的总数减少了，那么可能合法捕捞和非法捕捞的数量都减少了，那么非法捕捞的数量就不是9000
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