gmatprep里得一道逻辑,完全看不懂

Matrixrl

今天做了prep有题不懂,大家来帮忙看看

Matrixrl

图怎么发不上来....

Matrixrl

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 seriouly undermines the argument?

a.cofirming that the shungit 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 amount of carbon, from which the fullerenes apparently formed

d.The natural occurring fullerenes are arranged in a previously unknown crystalline structure

e.shungite itself is formed only under distinctive conditions.

Matrixrl

这题在说什么有谁能说一下大概吗?

mbz

以下是引用Matrixrl在2006-11-7 20:35:00的发言：

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 seriouly undermines the argument?

a.cofirming that the shungit 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 amount of carbon, from which the fullerenes apparently formed

d.The natural occurring fullerenes are arranged in a previously unknown crystalline structure

e.shungite itself is formed only under distinctive conditions.

Please double check word by word see if you have any typing mistake. I have interest to take a look at this question too.

FlowerJay

楼主俺来献丑。俺的想法是，说这种冬冬在很extreme的实验室条件下合成，在地球上找到了这种冬冬，于是说可以由此推测地球在这些咚咚形成时候的地壳条件。要weaken这种推测，我们可以预测答案方必然是说找到了这种冬冬，也没办法预测地球的地壳条件。两种可能，试验推不出地壳条件；这冬冬形成和地球没啥关系； 看B选项：这些冬冬在流星雨中被发现，也就是说这玩意儿有可能不是在地球形成的，换句话说没啥关系。 请大家指教

ereanor

答案是啥？

我选了C

ereanor

我觉得B不是很对，不知道我的理解对不对

因为题中说＂they have since been found in nature＂

B中说＂also been found on the remains of a small meteorite ＂，即这两种source是可以被区别的，不会产生误判断

而C是说nature中发现的fullerenes存在于shungit里，shiungit又含carbon，因此在它存在的N年中只要遇到适当的温度和压力就能产生fullerenes（象实验室里一样），那么在同一个shungit里即存在不同时代的fullerenes,无法判定地壳状态

不知道俺这样理解对不对

lucyzl517

以下是引用ereanor在2006-11-8 0:25:00的发言：

而C是.......因此在它存在的N年中只要遇到适当的温度和压力就能产生fullerenes（象实验室里一样），那么在同一个shungit里即存在不同时代的fullerenes,

楼上的,这段纯属你的发散思维,题目和C选项中没有提到也没有暗示,而且也推测不出上面的文字

并且我认为C选项只是把题干内容重复了下,没有起任何削弱和支持的作用

FlowerJay解释的B很清楚

[此贴子已经被作者于2006-11-8 3:11:14编辑过]

Matrixrl

sorry, i've forgotten to give u the key, the choice is D