标题: 一道GMATPREP题 [打印本页]
作者: martinawys 时间: 2009-2-2 21:02 标题: 一道GMATPREP题
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 fullerrenes requires discintive 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.
作者: sea3ufooio 时间: 2009-2-3 07:49
D说明年代可能还要久远，所以不能准确的推断出来
作者: martinawys 时间: 2009-2-3 20:00
D 说天然的fullerene以一种以前未知的晶体形态出现
怎么说明年代久远？说这种晶体形态和实验室里弄出来的不一样， 因此环境可能不同吧。
anyway D是正确选项。
作者: wumeier 时间: 2009-2-8 13:33
D indicates something different from that occured in the laboratory
.Hence ,the conclusion based on the conditions used in laboratory won't be
drawn.
Different minerals indicate different conditions happened when the
minerals formed.
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