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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 unfounded.

 

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

 

1. 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.
2. Female Merrick sea turtles begin returning to Baker’s Beach to lay their eggs when they are ten years old.
3. Under normal conditions, only a small proportion of hatchling female Merrick sea turtles survive in the ocean until adulthood and return to lay their eggs at Baker’s Beach.
4. 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.
5. 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.

B     母海龟10岁回来产卵能削弱什么啊？

jiaojiao1426

原文：1.五年前某CHEMICAL SPILL导致当年所有蛋都无法孵化。

2.五年来回来产卵的海龟数字增加

结论：CHEMICAL SPILL没有造成影响

B：海龟10岁的时候回来，所以现在回来的海龟在SPILL的时候已经5岁了，她们没有被化学物质影响到。而五年前无法孵化的蛋会导致当年的海龟数量骤减，这个效应应该在5年后产生。

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