狒狒一题求教

wanglijie · 发表于 2003-7-27 18:40:00

38. 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.

答案为A，我怎么觉得是D

mike1999 · 发表于 2003-7-27 19:09:00

D是加强,排除了是inhabitat的原因造成的.A无论UV_B是否唯一的辐射,都和该结论没有什么关系.

cranberry · 发表于 2003-7-27 19:29:00

d是排除它因，应该有加强的意思。A是说只有UVB是影响基因的，但这不能加强论证

wanglijie · 发表于 2003-7-27 21:13:00

thanks

狒狒一题求教

狒狒一题求教

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