求教~狒狒逻辑38题目~

端木瑶 · 发表于 2011-7-18 00:50:03

38. Amphibian populations are declining in numbersworldwide. Not coincidentally, the earth’s ozone layer has been continuouslydepleted throughout the last 50 years. Atmospheric ozone blocks UV-B, a type ofultraviolet radiation that is continuously produced by the sun, and which candamage 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 orhard shells. Thus, the primary cause of the declining amphibian population isthe 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 atmosphericozone, UV-B is the only type that can damage genes.
(B) Amphibian populations are declining far more rapidlythan are the populations of nonamphibian species whose tissues and eggs havemore natural protection from UV-B.
(C) Atmospheric ozone has been significantly depleted aboveall the areas of the world in which amphibian populations are declining.
(D) The natural habitat of amphibians has not become smallerover the past century.
(E) Amphibian populations have declined continuously for thelast 50 years.

我看坛子里有好多争论这道题目的帖子~我最开始也选择的D `~看了争论又貌似觉得A 是的~soga~我就不知道到底是A还是D了~谁能给个正解啊~ 万分感谢！

杂色百合2012 · 发表于 2011-7-18 08:30:37

pansimply · 发表于 2012-7-2 23:14:45

UV-B影响基因和数量减少没有必然联系。可以参考选项B，选项B其实是给了一个UV-B和动物数量之间的关系。所以A只说UV-B损害基因是并不是加强。

D中。如果栖息地没有变得更小的话，说明臭氧层枯竭可能是一个影响amphibian的原因，如果变小的话，有可能就算臭氧层枯竭了对两栖动物的影响也不大。

求教~狒狒逻辑38题目~

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