[讨论]XDF补充材料上的最新机考题（四）

ring_cheng

328. A major chemical spill occurred five years ago at Baker’s Beach, the world’s sole nesting ground for Mererick 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 ahs proven unfounded.

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 occurred 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 bides 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 no been affected by the spill.

Key:B

请教一下这道题的解题思路？

[此贴子已经被作者于2005-4-23 12:02:58编辑过]

ring_cheng

I am looking up

you are showing up

and then we both cheering up

'coz the problem has been ended up

But what i can do now is only up up up......

lawyer_1

认为答案为E。问题实质问支持环境学家的预测：M的数量将会因为某药物而减少。E支持该观点。其它无关。

ring_cheng

原来我也对B怀疑，现在证实了。谢谢！

ring_cheng

又看了一下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 no been affected by the spill.

觉得它的BY用得有点怪怪的：

这里的by transferring 的动作发出者好像应该是environmental group吧。如果是这样的话，那么他们把海龟蛋移到一个没有被污染的海滩上应该是incease 海龟数量的，这又和他们rejected a proposal to increase the Merrick sea turtle population 的意思相反。这是怎么回事呢？

再看回B. Female Merrick sea turtles begin returning to Baker’s Beach to lay their eggs when they are ten years old. 是不是说：正常来说，五年前生的小海龟（蛋）需要十年以后才能回来产蛋，可是五年前的蛋都被spill破坏了。所以十年以后海龟的数量还是会下降，而五年前来下蛋的海龟数量上升这只是暂时的现象（因为spill只对蛋而不对成年的海龟起作用）？？

wj

agree B

lawyer_1

同意B

E的意思为：有人建议环境团体将蛋移到安全地方，以增加海龟数量，但环境团体拒绝了。但不是答案。因为环境团体不做，别的可以做。关键是原文得出结论的隐含假设为：Hatch出来的海龟多于死去的海龟，所以每年回来的海龟仍然越来越多。B说这个假设不成立。因为hatch出来的海龟还没回来。E对这个前提没起作用。

ring_cheng

关键是原文得出结论的隐含假设为：Hatch出来的海龟多于死去的海龟，所以每年回来的海龟仍然越来越多。B说这个假设不成立。因为hatch出来的海龟还没回来。

还是Lawyer的解释牛，比我的罗里罗嗦强多了！赞一个！

[此贴子已经被作者于2005-4-24 20:35:40编辑过]

3rocksh

精辟！