标题: 求教~狒狒逻辑38题目~ [打印本页] 作者: 端木瑶 时间: 2011-7-18 00:50 标题: 求教~狒狒逻辑38题目~ 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.