标题: BIBLE 中的一题 [打印本页] 作者: kirbm 时间: 2012-2-17 17:53 标题: BIBLE 中的一题 4. 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.
请大虾指点，谢谢作者: sdcar2010 时间: 2012-2-19 09:48
However, does the passage talk about gene damage in amphibians? Does the conclusion have anything to do with genes damage?作者: zhangjingsky 时间: 2013-10-24 22:48
答案就是A，A选线可以反过来理解，如果UV-B不是唯一的破坏基因的射线，有很多射线都破坏基因，但是这些射线都被臭氧挡掉了，所以臭氧的消失对Amphibian populations是有影响的，但是和UV-B是不是唯一破坏基因的射线没有关系。这题比较阴险。