1. (24179-!-item-!-188;#058&000705)
Although fullerenes--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 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 occurring fullerenes were formed.
Which of the following, if true, most seriously undermines the argument?
(A) Confirming that the shungite genuinely contained fullerenes took careful experimentation.
(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 occurring fullerenes are arranged in a previously unknown crystalline structure.
(E) Shungite itself is formed only under distinctive conditions.
为什么选d不选e?非常感谢！
原文是说一种原因产生此结果，要削弱原因的唯一性，就是异因同果。所以在选项中找他因就是选项。
D) The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.
另一种不知的结构就是他因。正确。
E）Shungite itself is formed only under distinctive conditions.
原文说fullerenes在自然界条件下，formed in fissures of the shungite。这只是一结果，而shungite itself，我们无根据它直接与fullerenes的形成相关。注意itsself, 我觉得是提示。
看选项时，要记住题目问的是什么。我们要找的是实验室条件与fullerenes形成的关系不具有唯一性
B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
无关选项。fullerenes在哪里被发现，与它的形成不构成绝对关系。而且碰撞时的条件我们无法判断，起码没有给与线索，可能相同可能不同。与支持与反对都无关。
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