[求助]一道真题 以前好像没有讨论过 请教！

 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 the adult female Merricks returning to lay their eggs at Baker's Beach has actually increased somewhat since five years ago. Clearly, environmentalist's prediction that the world's Merrick population would decline as a result of the spill has proven unfounded.

问削弱environmentalist's 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.

答案是B。C,D, E 都可以容易排除。 想不明白为什么是B。

请教！

A无影响。

B中的10年则跨越了5年前化学污染的影响。注意文章第一句的：prevented nearly all the eggs laid that year

先谢谢allfar！

可我怎么还是想不明白啊！

到底是要削弱 降低 还是要削弱 是因为化学污染？

而且，我还觉得B说的没什么关系。。。。。看来一点也不理解这道题啊！

再次求教！