求助大全 Test19-15 谢谢~

zyzrafa · 发表于 2011-5-2 11:23:37

15.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 three similar species at the same time.

(D) In many species, individuals display quite marked variation.（C）

(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.

是说要削弱paleontologists的看法么 C怎么看出来了呀他只说没有一个area能同时存在超过3种相似的和把这标本分成16种有什么关系呢
谢谢各位啦~O(∩_∩)O

sdcar2010 · 发表于 2011-5-2 11:48:21

If C is true, then "[n]o geographical area ever supports more than three similar species at the same time." If so, the "the specimens used to distinguish eleven of the species come from animals that lived in the same area at the same time" would be a big liability since these 11 species should belong to no more than 3 triceratops. Thus, the paleontologists' classification using these "11" species is wrong!

A enables the conclusion.

zyzrafa · 发表于 2011-5-2 12:07:45

to #1
Thank you very much！

求助大全 Test19-15 谢谢~

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