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标题: 请教gwd-30-32 [打印本页]

作者: scotfield 时间: 2007-11-12 16:46
标题: 请教gwd-30-32

Q32:

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?

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

请教为什么选择b？谢谢！！

作者: dio123456 时间: 2007-11-12 17:29
文中说5年前有化学物质泄漏，五年前，在这个海滩上，然后因为这五年来上来下蛋的海龟越来越多，所以证明化学物质泄漏对海龟没有影响，

你要考虑到这些上来下蛋的海龟不是遭受污染的那批蛋孵出来的，这个就是b了

作者: lynn_ql 时间: 2009-7-22 03:21
OK

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