(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.文章分析: