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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.
自从出现非法捕虾活动开始，合法捕虾捕获的数量开始下降。
1996年尽管合法捕虾活动没有减少，但是抓到的虾比起1992年抓到的减少了9000tons,-> 这是因为那一年非法捕虾抓走了9000tons。问assumption
choice a, 非法捕虾活动没有那么严重以至于湖里面虾的数量到了1996年已经减少了。取非，到1996年虾的总数减少了，削弱结论。说明合法减少的虾数量不完全是因为非法捞走的
choice b, 非法捕虾船平均抓到的虾自从1992年开始增加。irrelevant
可以详细说一下取非怎么理解吗？
取非就是在谓语动词之前加一个否定词not, 比如：I went to school yesterday, 取非就是I did not go to school yesterday. 这种是最简单的：肯定句变否定句& 否定句变肯定句
复杂一点的就是当出现all，majority，some这些表示范围的词取非，这种就要根据具体情况，可以在CD论坛上找找CR Bible,里面有一章专门讲范围取非的
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