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请教一题狒狒逻辑

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楼主
发表于 2007-8-2 17:32:00 | 只看该作者

请教一题狒狒逻辑

Amphibian populations are declining in numbers worldwide. Not coincidentally, the earth’s ozone layer has been continuously depleted throughout the last 50 years. Atmospheric ozone blocks UV-B, a type of ultraviolet radiation that is continuously produced by the sun, and which can damage genes. Because amphibians lack hair, hide, or feathers to shield them, they are particularly vulnerable to UV-B radiation. In addition, their gelatinous eggs lack the protection of leathery or hard shells. Thus, the primary cause of the declining amphibian population is the depletion of the ozone layer.

Each of the following, if true, would strengthen the argument EXCEPT:

(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.

(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from UV-B.

(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.

(D) The natural habitat of amphibians has not become smaller over the past century.

(E) Amphibian populations have declined continuously for the last 50 years.

为什么选A 啊? D 看上去好象是答案啊!

谢谢牛牛们帮忙!

沙发
发表于 2007-8-2 21:54:00 | 只看该作者
D一看就是否定他因,加强!就是因为它的自然生长环境没有变换,所以这个物种的减少就是ozone的责任了~ A是无关选项啊,什么种类的radiation有什么关系,只用看准结论和前提~
板凳
 楼主| 发表于 2007-8-2 22:19:00 | 只看该作者
谢谢了!
地板
发表于 2007-8-2 22:20:00 | 只看该作者

在D中,如果栖息地变小,可以解释数量变小,引入他因,所以削弱。

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