问一个逻辑题，FeiFei38

poorleafes

38. Amphibianpopulations are declining in numbers worldwide. Not coincidentally, the earth’sozone layer has been continuously depleted throughout the last 50 years.Atmospheric ozone blocks UV-B, a type of ultraviolet radiation that iscontinuously produced by the sun, and which can damage genes. Becauseamphibians lack hair, hide, or feathers to shield them, they are particularlyvulnerable to UV-B radiation. In addition, their gelatinous eggs lack theprotection of leathery or hard shells. Thus, the primary cause of the decliningamphibian population is the depletion of the ozone layer.
Each of thefollowing, if true, would strengthen the argument EXCEPT:
A.      Of the various types ofradiation blocked by atmospheric ozone, UV-B is the only type that can damagegenes.

B.       Amphibian populations aredeclining far more rapidly than are the populations of non-amphibian specieswhose tissues and eggs have more natural protection from UV-B.

C.       Atmospheric ozone has beensignificantly depleted above all the areas of the world in which amphibianpopulations are declining.

D.      The natural habitat ofamphibians has not become smaller over the past century.

E.       Amphibian populations havedeclined continuously for the last 50 years.
答案是D 我认为是A
关键结论是: depletion of the ozone layer -> decliningamphibian population 而不是 UV-B->decliningamphibian population
所以A中，即使UV-B是one of the types that can damage genes 也没有错啊。

D说1个世纪以来一直没有下降，那就是一种支持，是50年来的depletion of the ozone layer导致的，而不是别的什么原因。

谢谢

liaoyoumin

这个A,D答案有争议的，你去搜搜看
了解下思路就是了，呵呵

lanpingzhen

垃圾题

ETS出题的人自己都没想清楚

一道烂题害人至深啊

xiao19870205

d是排除他因，  The natural habitat ofamphibians 不是影响population的原因， 这样  由于臭氧层破坏对其造成影响 就得到加强了，    A的话  他是唯一一种  并没有加强，    文中就说到那个UV-B 是其中一种了， 我觉得如果改成 除了UV-B 还有好几种射线 can damagegenes 的话  才是加强。   希望对你有帮助

mandying

我认为正确答案应该是A.
D项是排除他因，排除了栖息地减少造成这种后果的可能。

至于A项，注意，题目结论是说 the depletion of the ozone is the cause, 而不是UV-B is the cause.   所以A项是无法支持结论的