求助：PREP P1 CR1;#058&000705

tjk879

PREP P1 CR

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.

PREP答案为D，个人认为答案C：因为题目结论为naturally fullerenes为评价其形成阶段的地球条件提供了测试基础，但如果naturally fullerenes的形成并不局限于地球条件，而是如答案C所说，与nineral本身成分有关，则原结论被削弱。

crazecat123

C 根本就是重复文章里的话，跟加强和削弱没关系。。。

Whitney

Always try to find the logic structure, then see how a conclusion is deduced based on logic--because it is Critical Reasoning.

Premise :  Fullerenes synthsized in laboratory requires distinctive conditions of temperature and pressure
Conclusion: Fullerenes found in shungite requires a similar conditions of temperature and pressure
Assumption: Fullerenes synthsized in laboratory =Fullerenes found in shungite
    

小宇宙2009

B是他因啊  就是说 也在地外小行星中发现  
那么 那个F 就不一定 是 远古前 地球地壳中某种环境下形成的了

neo53

crazecat123 发表于 2007-10-14 12:35
C 根本就是重复文章里的话，跟加强和削弱没关系。。。

good  job!!!!!!!!!!!!!!!