新东方蓝书逻辑96页249题

maldini109

Over the last century, paleontologists have used small differences between fossil specimens to classify triceratops into sixteen species. This classification is unjustified, however, 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 the following, if true, would enable the conclusion of the argument to be properly drawn?

 a. Not every species that lived in a given area is preserved as a fossil.

b. At least one individual of every true species of triceratops has been discovered as a fossil specimen.

c. No geographical area ever supports more than 3 similar species at the same time.

d. In many species, individuals display quite marked variation. e. Differences between fossil specimens of triceratops that came from the same area are no less distinctive than differences between specimens that came from different areas.

不大明白，请高手指点迷津

CoralOcean

我选C,因为只有C是完全针对原文的结论来回答的，原文说的是in the same area at the same time,原文说这种分类是不可靠的，因为用来区分11种物种的标本生活在同一地区和同一时间，结论给出的是从来没有一种地理学支持有3种以上的物种生活在同一时期，所以原文说的有道理。

maldini109

谢谢解答，答案的确是c，那么原文的classify triceratops into sixteen species是没用的信息？

CoralOcean

个人觉得无关，对结论的推出没有多大影响，连11个都无法区分，那又怎么能够区分16个呢。