本帖最后由 Mason.PD 于 2009-6-15 13:19 编辑
这篇文章我已经被lela改过了 今天再次把修改后的贴上 望各位继续猛烈拍砖吧!
207.It is known that in recent years, industrial pollution has caused the Earth's ozone layer to thin, allowing an increase in the amount of ultraviolet radiation that reaches the Earth's surface. At the same time, scientists have discovered, the population of a species of salamander that lays its eggs in mountain lakes has declined. Since ultraviolet radiation is known to be damaging to delicate tissues and since salamander eggs have no protective shells, it must be the case that the increase in ultraviolet radiation has damaged many salamander eggs and prevented them from hatching. This process will no doubt cause population declines in other species, just as it has in the salamander species.
我们知道近年来工业污染导致地球臭氧层变薄,使到达地球表面的紫外线辐射增加。同时,学者发现在山区湖泊产卵的某种蜥蜴的数量下降了。由于紫外线辐射能够破坏脆弱的组织并且蜥蜴的卵没有保护壳,因此一定是紫外线辐射的增加破坏了很多蜥蜴的卵并阻止它们孵化。这一过程无疑也会导致其他物种数量的下降,就像发生在这种蜥蜴身上的一样。
论点:增加的紫外线辐射会使山区蜥蜴和其他物种数量下降
论据:1 山区湖泊产卵的某种蜥蜴的数量下降了
2 紫外线辐射能够破坏脆弱的组织并且蜥蜴的卵没有保护壳
破题点:1 仅仅是山区湖泊的蜥蜴数量减少,不能说明其整个总群的数量减少。
2 湖泊的蜥蜴数量减少,可能是因为当地的原因,比如河水污染
3不能类比其它物种,孵化后代的方式不一样。可能根本不受影响
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