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.
答案为什么是D?
were first found in the laboratory, they have since been found in nature（插入语）, formed in fissures of the rare mineral shungite. 说明了实验室里发现的构成fullerenes的fissures是在是石墨里的，D说自然界发现的fissures是在晶体里的，那么用合成石墨的条件来评估地壳里合成晶体的条件，自然就削弱了论断。
那个插入语容易混乱你的思维吧？
真应该跟你一起学，你一点就顿开茅塞。
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