ChaseDream

标题: 实在理解不了，求帮助 [打印本页]

作者: 咖啡豆要煮自己 时间: 2013-12-24 22:39
标题: 实在理解不了，求帮助

Although fullerenes--sphericalmolecules made entirely of carbon--were first found in the laboratory, theyhave since been found in nature, formed in fissures (裂缝)of the rare mineral shungite. Since laboratory synthesis of fullerenes requires distinctive conditionsof temperature and pressure, this discovery should give geologists a test casefor evaluating hypotheses about the state of the Earth's crust at the timethese naturally occurring fullerenes were formed.

Which of the following, if true,most seriously undermines the argument?

(A) Confirming that the shungitegenuinely contained fullerenes took careful experimentation.

(B) Some fullerenes have also beenfound on the remains of a small meteorite that collided with a spacecraft.

(D) The naturally occurringfullerenes are arranged in a previously unknown crystalline structure.

(E) Shungite itself is formed onlyunder distinctive conditions.

这道题我想半天实在不明白D选项是怎么削弱结论的，麻烦明白的童鞋帮帮忙吧，谢谢~~~

作者: isabella5858 时间: 2013-12-30 20:26
Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure, this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these naturally occutting fullerenes were formed.蓝字是用这东东来做研究的前提,表示学者将根据他们掌握的这东东的实验室数据来对地球做评估.

D, The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.

D说了这东东的情况跟学者掌握的不同,是人们不知道的,所以无从着手来根据这东东对地球做评估了.

By 二狼神

欢迎光临 ChaseDream (https://forum.chasedream.com/)