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标题: 求解feifei-271,十分的绕啊!!! [打印本页]

作者: amanda2078    时间: 2007-2-11 22:09
标题: 求解feifei-271,十分的绕啊!!!
][求助]绿皮书328题 大全中找不到 帮忙啊~~

328. A major chemical spill occurred five years ago at Baker's Beach, the world's sole nesting ground for Merrick sea turtles, and prevented nearly all the eggs laid that year from hatching . Yet the number of adult female Merricks returning to lay their eggs at Baker's Beach has actually increased somewhat since five years ago. Clearly, environmentalists' prediction that the world 's Merrick population would decline as a result of the spill has proven un founded.

Which of the following, if true, most seriously undermines the argument offered in refutation of the environmentalists' prediction?

A. The chemical spill five years ago occured at a time when there were neither Merrick sea turtles nor Merrick sea turtle eggs on Baker's Beach.

B. Female Merrick sea turtles begin returning to Baker's Beach to lay their eggs when they are ten years old.

C.Under normal conditions, only a small proportion of hatching female Merrick sea turtles survive in the ocean until adulthood and return to lay their eggs at Baker's Beach.

D.Environmental pressures unrelated to the chemical spill have caused a significant decline in the population of one of the several species of sea birds that prey on Merrick sea turtle eggs.

E. After the chemical spill, an environmental group rejected a proposal to increase the Merrick sea turtle population by transferring eggs from Baker's Beach to nearby beaches that had not been affected by the spill.

XDF书上给的答案是B,我选的是C, 哪位NN来解释一下啊?

C也应该是削弱的一种阿?海龟回来这么多明显反常阿?


作者: ivysopher    时间: 2007-2-12 00:09

我觉得应该是B阿,C说只有一小部分雌海龟会在b产软和题干说的5年后在B产软的海龟“稍微”多了一些完全没有相关联的关系;如果楼主觉得c暗示了反常,那么这种反常也不能和B的削弱程度相比:产卵的海龟都要长到10岁,而现在比5年前反而多了,说明5年前的泄漏并没有使海龟数量减少--直接和题目结论相关;

个人意见,仅供参考


作者: LOUI1121    时间: 2007-2-12 00:32
我估计楼主把题理解错了,结论是:环境学家预测海龟数量会下降是错误的。题目问的是哪个能削弱这个结论,也就是哪个能支持环境学家关于海龟数量会减少的预测。

B选项,说明那些回来下蛋的母海龟都是10年以前生的,而不是5年前那批。正确答案。
C选项,是削弱环境学家的观点, 因为一般情况下,很少数量的海龟能过活下来,也就是说那个OIL SPILL不                    回对海龟的数量产生太大的影响。

作者: amanda2078    时间: 2007-2-13 20:38
谢谢回复!




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