【请教】GMATPrep的题目

myronx

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 space craft.

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.

答案D，为什么不是B？

ktj

以下是引用myronx在2007-9-12 21:37:00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 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 space craft.

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.

答案D，为什么不是B？

题意:虽然f先在实验室里发现,但它在自然界也已经被发现,是在shungite的缝隙中.   因为f在实验室的合成需要特殊的温度和压力条件,所以这个发现给了学者们一个案例,来猜测大自然界f形成时期的地壳的情况.

myronx

我完全看懂了题目和每一个选项的意思(即便不是每个单词都认识,也能猜个八九不离十),可是,到底怎样解释D是削弱呢?gmatprep的官方答案