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miguel29 · 发表于 2010-11-10 14:52:07

Over the last century, paleontologists have used small differences between fossil specimens to differences between fossil specimens to classify triceratops into sixteen species. This classification is unjustified, howver, since the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time.

Which of following, if true, would enable the conclusion of the arguement to be properly drawn?

No gegraphical area ever supports more than three similar species at the same time.

谁能帮我解释一下吗？怎么推导出来的？谢谢

kevin0214 · 发表于 2010-11-10 15:24:04

NO gegraphical area ever supports MORE THAN THREE similar species at the same time.
==>the ELEVEN of the specimens come from animals that lived in the same area at the same time CANNOT come from SIMILAR species.
==> some of them must be the fossil specimens of other species(not triceratops)
==> the classification is unjustified（Because it use other animals' fossil specimens to classify triceratops into sixteen species)

miguel29 · 发表于 2010-11-10 16:38:10

不好意思，还是不太明白，再具体点可以吗？谢谢啦

kevin0214 · 发表于 2010-11-10 17:02:51

选项No gegraphical area ever supports more than three similar species at the same time.说明没有一个地方可以同时支持三种类似的物种。
the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time.
但是，题目中考古学家用了11种在同一个地方同一时期的样本来作分类的依据。
some of them must be the fossil specimens of other species(not triceratops）那很显然不可能11种都是类似的物种，所以不可能都是三角龙类。
the classification is unjustified（Because it use other animals' fossil specimens to classify triceratops into sixteen species) 所以考古学家的研究是有问题的，怎么能用非三角龙的样本来作三角龙的分类依据呢？

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