求助PREP逻辑一道

alanuonuo

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. Sine laboratory systhesis 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 occuring fullerenes were formed.
Which of the following, if ture, most seriously undermines the argument?
A Cinfirming 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 apprently formed.
D The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.
E Shungite itself is formed only under distinctive conditions.

答案D，没看明白题意。

alanuonuo

这题是太简单了还是咋地，怎么么人理里？

wangsiwei

这个题我也想了挺久。
这个实际上是一个类比题。
实验室生产出的F是在某个条件下生产出来的，所以自然界的F也应该在相应的条件下产生。这里有一个类比实验室F＝自然界F，如果要weaken的话，就要指出这两个东西实际是不一样的。D就是这个意思，一种不知道的structure就说明了和实验室F的不一样了。

alanuonuo

哦，原来如此，我看到答案迷迷糊糊觉得应该是这个意思，快速读完题的时候发现很多词不认识，选项里还都有shungite，于是胡乱选了个C，唉！

谢谢楼上wangsiwei～

wangsiwei

类似的类比题还有这样的

13.    (26741-!-item-!-188;#058&002910)
Which of the following most logically completes the argument?

United States manufacturers currently produce most of the world's solar-power generators--most of which are exported to Europe.  However, European manufacturers are emerging and probably will ultimately capture much of the European market.  The United States government is funding initiatives intended to encourage use of solar power within the United States.  If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels, since __________.

(A) some United States manufacturers have been substantially increasing their output over the last several years
(B) the efficiency of solar-power generators in converting energy from the Sun into electric power is not improving as fast as it once did
(C) just as European manufacturers enjoy certain competitive advantages in Europe, so do United States manufacturers in the United States
(D) European governments are currently undertaking initiatives to stimulate the use of solar power within Europe
(E) the current market for solar-power generators in the United States is very limited

不过这个类似于support，不是weaken。如果support就是要指出两个比较的东西是一样的。

不知道说清楚了没有。大家讨论哈

alanuonuo

嗯，这题我知道选C，当时做的时候觉得E的干扰也挺大的。这个是直接说明类比关系了吧？

wangsiwei

我觉得是，直接说明两个东西是一样的。GMAT的类比题不多，但会很绕。有时候还会过去和现在的类比。读题要很当心。如果涉及到两个平行的东西，就要考虑类比了。

alanuonuo

是的，一定要当心～

zhj1988428

其实一望过去我也感觉是一片生词。。。。不知道到底在讲什么
但是我会选D，因为我读完一遍后，感觉到的意思就是：有个东西X，它是在实验室里发现的，而且只能在实验室里温度和各种条件下才发现。这个发现对地理学很有价值，因为它可以让人知道这个东西刚形成的时候地球的情况是什么样的（没有查过任何生词，就凭第一遍看过的感觉翻译的）
这里我感觉到这个现在的样子不一定跟以前的一样，刚好D跟我的想的一样，就选了