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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.
我觉得这个题有bug，B应该比D更贴切。
因为B说明了这个来自natrue的F物质也许根本就不是地球自己生成的，而是由于外星陨石撞到地球才出现在地球上的。所以F物质的形成和地壳根本就没有什么关系。
至于D，说自然生成的F有着以前不知道的晶体结构。但，以前知不知道和这道题有什么关系？科学家在搞明白这个F物质的结构，从而可以在实验室人工合成之前，不也是不知道这个F物质的结构么？也许这个F物质本身就能有千万种不同的结构来存在呢？不管以哪种结构存在，不都是F物质么，物质本身又没有变。 D成立的条件是基于一个 “结构不同，需要的压力和温度条件就不同” 的假设的。它预设了这样一个前提，而题干里面完全没有没有信息可以证明这个前提存在。
所以综上 我觉得B的逻辑更加清晰和有效。因为他直接提供了一个F物质可能根本就不是在地球上形成的证据。
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