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标题: PREP 逻辑一题，题目看不懂，也无思路，请NN指点一下 [打印本页]

作者: georgeqianes 时间: 2007-1-2 13:07 标题: PREP 逻辑一题，题目看不懂，也无思路，请NN指点一下

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.

ANS：D

作者: autumnjin 时间: 2007-1-3 20:00

The hidden assumption:

The naturally occurring fullerenes are the same as those formed in the lab.

Based on the assumption, by comparing with the fullerenes produced in lab, we can know the conditions when the naturally occurring fullerenes are formed.

However if the two fullerenes are different, then the conclusion of the argument cannot hold.

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