prep 逻辑问题请教！！

toastgmat · 发表于 2012-5-27 13:42:10

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

想问下各位牛人，这题怎么分析？

hartmann · 发表于 2012-5-27 22:15:04

看能不能这么理解：

1）F 物质，在实验室里人为生成的，是碳结构。
2）实验室里生成时，要求特殊温度和压力，因此这种模拟能够帮助了解：F物质形成时的地壳情况，即温度和压力。

这里明显有个必要条件：实验室里生成的 F物质，要和自然界里的自然生产的 F物质，完全一样。如果生成的结果不一样，那么生成时的情况未必就会一样。

文中第一句并没表达这个意思。

而D选项，直接攻击了这个必要条件：自然生成的 F物质是水晶结构。（实验室生成的，是碳结构）

Stephanie729 · 发表于 2012-8-26 12:27:48

lab里生成F需要什么条件，推出since自然界生成F也需要同样的条件，所以进一步推出自然界出现F的地存在和实验室同样的条件。 weaken就是说自然界生产F和lab的结构啊原因什么的不同，所以条件也不同啦~~~题目我没怎么看懂因为专业词汇太多啦，但大概意思我觉得是这样

prep 逻辑问题请教！！

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