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标题: 12月jj,找到那倒海龟题了 [打印本页]

作者: yl1004 时间: 2006-12-8 06:53
标题: 12月jj,找到那倒海龟题了

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?

b。

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.

作者: paulfrank11 时间: 2006-12-8 07:45
能解释有一下这道题为什么选b么？

作者: uibewsj 时间: 2006-12-8 09:27
由五年前的两个现象：
1. Spill prevented eggs from hatching.
2. Yet more adult female turtles returned to lay
eggs.

得出结论：
Turtles' population would not decline.

削弱：受影响的海龟还不到下蛋的年龄

作者: paulfrank11 时间: 2006-12-8 10:20
明白了，5年来hatching的海龟都是没有受到海洋污染之前就出生的海龟~~

作者: uibewsj 时间: 2006-12-8 10:39
嗯哪~
要是考试都碰到见到过的题目就好了
要不然还得重新outline story...

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