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1 Although fullerenes-spherical molecules made entirely of carbon-were 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 the 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  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 condition

Answer: D

问题：1 为什么D

          2 nature fullerenes or synthesis fullerenes 一样吗？

1. D的意思是指自然形成的和实验室形成的F不一样，所以形成条件也应该不一样，削弱。

2. 题目里没说。D说了不一样，所以D是答案。

自己的想法，仅供参考