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GMAT逻辑实例解析:数量范围题

未知GMAT2016-10-17 11:34

摘要:数量的范围是逻辑题常考,特别是MUST BE问题,混淆答案也常来于此。下面一题是LSAT,先讨论,后再公布答案及解释。 The importance of the ozone layer to terrestrial animals is that it entirely filters out so

  数量的范围是逻辑题常考,特别是MUST BE问题,混淆答案也常来于此。下面一题是LSAT,先讨论,后再公布答案及解释。

  The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

  Which one of the following is most strongly supported by the statements above, if they are true.

  A). All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.

  B). Few species of animals live on a part of the earth\'s surface that is not threatened by holes in the ozone layer

  C). Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight

  D). A single wavelength of sunlight can cause severe damage to the eyes of most species of animals

  E). Some wavelengths of sunlight that cause eye damage are more likely to reach the earth\'s surface where there are holes in the ozone layer than where there are not,

  分析部分:

  The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

  Which one of the following is most strongly supported by the statements above, if they are true.

  A). All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.错的原因:All wavelengths 太strong。原文只知完好的臭氧层滤掉一部分光,让一部分通过,并说通过的那部分对很多动物有害。从这点很容易误认有害的都给滤掉了。其实原文没说是否那通过的一部分是否含有有害波长。所以错。

  原文问:is most strongly supported by the statements above,如果问哪个选项support 结论。A应该是个好选项。非常strong!但是因为是被原文支持,选项不能超越原文提供的范围:some wavelengths 不能推出all wavelengths,所以A错了。

  B). Few species of animals live on a part of the earth\'s surface that is not threatened by holes in the ozone layer错的原因:原文只说有HOLE可能会使很多动物受伤害,从这点也许可以推出有动物生活在受HOLE威胁的地方,但原文没说有没有动物生活在不受HOLE威胁的地方,故错。

上一篇:GMAT逻辑知识点讲解:非形式逻辑
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