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.
答案是D。
看不懂，唉，PREP第一道就打击我。。。
我也不是很懂！！也希望有人解释一下啊
但被我撞对了！呵呵！但是是对文中的最后两句读的不是很懂！
不知有没有高手能翻译一下打意呢？？拜托！
仔细读了一下！觉得D是他因削弱！关键词是a previously unknown！
而ACE的错误是比较明显的！好像和文中所说的没什么关系！
B还是有点困惑！希望有人帮帮忙！解释解释！谢谢！
F-Lab with temperature and pressure, so F-nature need the same temperature and pressure.
D, explain the F-lab is different with F-nature, same molecures but different structure, so can't use condition in lab to deduce condition in natural enviroment.
本来不明白的，不过看了楼上的，貌似明白了
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.
但还是不太懂这句话什么意思？？
formed in fissures of the rare mineral shungite. 这句话 不是说 fullerenes--spherical 在 shungite中形成的么
D大概是想说 构造不一样 所以形成原因不一样
难道题目的fullerenes 和D选项的 fullerenes 不是一种物质么
个人理解：第一句中说了实验室中发现的F是spherical的结构，即球形。D答案说自然产生的F是是以一种未被发现的crystalline的结构，因此，形成的结构不一致，不能说明实验室合成的条件与自然形成的条件一样，否则就应该是一样的结构
我不明白的是为什么C不对，C说在mineral shungite有fullerenes的时候，它已经形成了，既然已经形成了，当然不能评估state of the earth's crust了
所以C不是也有削弱的意思吗？
fullerenes--spherical molecules made entirely of carbon--were first found in the laboratory
如果没有另外的知识，很难推断同样是fullerenes，有球形和crystalized structure两种形式却是同一种东西
GMAT不是只要基于常识就可以了么...
发现原来题目是没有结论的……这样的CR是可不可以理解为对范围的削弱？
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