prep 感觉很难 做第一题就云里雾里

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.

此题为什么D?

2  有人说正式考试时只会比这个（prep）难，不知道是不是真的这样？prep里的是真题的话怎么感觉和 og11里的题相比难得多

LZ不用担心，正式考试CR和prep差不多，当然比OG来讲还是不同的。

该题对我来说生词很多，但抓住前提结论还是比较容易的，因为在实验室符合某种情况，所以在自然界也应该符合某种情况（只有这样，实验室里的case才有evaluating hypotheses的价值）。

D选项说自然界的fullerenes和实验室发现的fullerenes是完全不同的，因此weaken了stimulus中的论证。

谢谢了，看起来我还需要在逻辑上下点功夫了！