2007 prep CR 1

naoyixue

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.

其实题目没有看太懂，为下能解释下吗？谢谢

naoyixue

问，再问

naoyixue

诶，继续问，烦请大家知道的说下，谢谢了

cdwayne

(B)

由碳構成的F在實驗室完成，但F也存在自然界的S裡，故實驗室可以依照製作F的條件判定當時地殼狀態。
這裡有個假設，自然界的S是在地球上完成的，反駁選(B)：F是外來的。

naoyixue

xiexie

Kb24

应该是D

题目是说LAB中合成fullerenes需要苛刻的温度和压力条件 - 自然界也找到fullerenes - 因此可以推出：当时自然界形成fullerenes的地质条件 （可能和lab中形成fullerenes的苛刻条件类似）

B 没有WEAKEN到，因为D虽然提供了ALTERNATIVE SOURCE, 但是没有排除确实有fullerenes formed in fissures of the rare mineral shungite。
D 说naturally occurring fullerenes 和LAB中合成的fullerenes不同，是 crystalline structure的 - 因此形成的条件就和LAB中合成fullerenes所需的温度和压力条件不同 - WEAKEN

cdwayne

應該是D

題目是說LAB中合成fullerenes需要苛刻的溫度和壓力條件 - 自然界也找到fullerenes - 因此可以推出：當時自然界形成fullerenes的地質條件 （可能和lab中形成fullerenes的苛刻條件類似）

B 沒有WEAKEN到，因為D雖然提供了ALTERNATIVE SOURCE, 但是沒有排除確實有fullerenes formed in fissures of the rare mineral shungite。
D 說naturally occurring fullerenes 和LAB中合成的fullerenes不同，是 crystalline structure的 - 因此形成的條件就和LAB中合成fullerenes所需的溫度和壓力條件不同 - WEAKEN

-- by 會員 Kb24 (2011/4/25 17:07:47)

"Unknown" is not equal to "different".

Kb24

Hey Cdwayne, you're raising a really good point.

I believe the difference is: the fullerenes synthesized in the lab is of "SPHERICAL" structure, whereas the one found in nature is "arranged in a previously unknown "CRYSTALLINE" structure"

cdwayne

Hey Cdwayne, you're raising a really good point.

I believe the difference is: the fullerenes synthesized in the lab is of "SPHERICAL" structure, whereas the one found in nature is "arranged in a previously unknown "CRYSTALLINE" structure"

-- by 會員 Kb24 (2011/4/25 17:52:54)

嗯...


關於(D), unknown is not equal to different.


要再說的話，一個是分子結構，一個是外觀，不能比較。

pueti

D是对的。
B中some是模糊词，但结论是this discovery可以检测state of the earth’s crust at the time fullerenes were formed，没有绝对词，结论也指的是some可以检测。
所以，要推翻这个some，不能用另一个some。

D针对的是这个some来推翻。