标题: 【求助】请教Prep 1-1 [打印本页]
作者: VictoriaSuns 时间: 2008-11-19 07:32 标题: 【求助】请教Prep 1-1
Although fullerences---spherical molecules made entirely of carbon---were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite. Since laborary 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 occuring fullerenes were formed.
Which of following, if ture, most seriously undermines the argument?
A. Confirming that the shungite genuinely contained fullerenes took careful experiment.
B. Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
C. The mineral shungite itself contains large amounts of carbon, from which the fullerenes apparently formed.
D. The naturally occuring fullerenes are arranged in a previously unknown crystalline sructure.
E. Shungite itself is formed only under distinctive conditions.
答案是D，虽然题目能看懂，但是答案还是不能理解，觉得选项E好像也有点对……
请高手帮忙解释一下，谢了
作者: michizer 时间: 2008-11-19 21:36
这題，我模考時選E。
事後想想，"Only under distinctive conditions"，雖然強調只有在某種特殊的情況底下fullerenes 會被發現，但仍然還是可以依照這個去檢驗該假設是否成立。
而D，是說明fullerenes 會在"unknown" crystalline structure裡。 所以就算有存在，還是沒辦法被發現。
唉.....解釋得我自己都不太懂了。
還是麻煩各位NN幫忙一下。 謝謝
頂!!
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