[求助] Prep破解 CR 2道题求教

kevin67_67

两道Prep破解里面的题目,

请各位大牛指点

请各位大牛指点

* 1.  (24179-!-item-!-188;#058&000705)

 

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.

这道题目我选了E,因为看到distinctive conditions

而答案是D, 不明白为什么会说到crystalline structure，以为是无关选项直接排除了呢.....

* 16.       (27621-!-item-!-188;#058&003223)

 

Most of the world's supply of uranium currently comes from mines.  It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that uranium fetches on the world market.  Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

 

Which of the following would it be most useful to determine in evaluating the argument?

 

(A) Whether the uranium in deposits on land is rapidly being depleted

(B) Whether most uranium is used near where it is mined

(C) Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater

(D) Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land

(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater

（选择答案时，在A,D,间徘徊，最后选了错误的答案。

  再次看题，结论是
            直到A发生，才会有B发生。题目问什么最能evaluate这个结论，那么预测正确答案是：该选项一旦确定，会对结论有支持，或者反对作用。

检测答案，A可能，B，E无关，D不会产生影响，如何排除C呢？

ambrosecelin

有关无关问题，我至今还没搞清楚过。。。。

lawyer大牛的贴好像找不到。。。。。。。

HuhuG7

第一题我也没搞清楚，请指点。

关于第二题，我给点建议。

evaluate题主要看的是:当你回答了选项，得出的结论为yes/no，那么会对文中的argument其加强作用；而答案是no/yes，则其削弱作用。只有这样的有可能会产生两方面作用的选项才是正确的。

Kevin，请以这个思路再想想这道题。

ambrosecelin

第一题我仔细分析了一下，看看会不会对你有帮助：

结论是：这将有利于评估地壳在naturally occurring fullerenes时的作用

直接前提：实验室的fullerenes的合成需要不同情况的温度和压力

D选项提出了一个情况，naturally occurring fullerenes的组织形态是一个不了解的结构，不同于实验室的fullerenes。证明该前提不能推出该结论

注意结论的具体性：naturally occurring fullerenes

eSpirit

以下是引用ambrosecelin在2008-4-10 9:44:00的发言：

第一题我仔细分析了一下，看看会不会对你有帮助：

结论是：这将有利于评估地壳在naturally occurring fullerenes时的作用

直接前提：实验室的fullerenes的合成需要不同情况的温度和压力

D选项提出了一个情况，naturally occurring fullerenes的组织形态是一个不了解的结构，不同于实验室的fullerenes。证明该前提不能推出该结论

注意结论的具体性：naturally occurring fullerenes

第一题，完全同意你的观点。

第二题，technological advances也好还是其他的办法也好，说的还不是要reduce the cost of extracting吗?所以没有任何作用.