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题库 / Prep2007E1-CR-1
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?
Confirming that the shungite genuinely contained fullerenes took careful experimentation.
Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
The mineral shungite itself contains large amounts of carbon, from which the fullerenes apparently formed.
The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.
Shungite itself is formed only under distinctive conditions.
类比推理：实验室的条件能不能推出现实的条件，那就找二者不同——D
尽管第一个F是在实验室被发现的，自然界的F都是在S里才有。实验室的F形成需要特点的条件，既然这样，实验室形成的F可以推断自然界的F形成的时候，地壳的状况。
A，F存在于S是题干给出的信息，不可质疑。否
B，一些F也存在在外太空。 CR：我是要推测地壳，与外太空是否有F无关。
C，S包含C，C组成F。CR：推测地壳，与C无关。
D，自然形成的F包含之前未知晓的晶体结构。CR：之前都不知道的晶体结构自然也生成不出来，说明实验室生成的F与自然界的F不一致，undermine。
E，S特定条件才生成。加强。
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