标题: prep 逻辑问题 请教！！ [打印本页] 作者: toastgmat 时间: 2012-5-27 13:42 标题: prep 逻辑问题 请教！！ Although fullerenes---spherical molecules made entirely of carbon--were first found in the laboratory, they have since found in nature, formed in fissures of the rare mineral shungite. Since laboratory synthesis of fullerenes requirs 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