prep1. CR1 (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.
答案为D，怎么绞尽脑汁都不明白阿
还请好心人回答哦
科学家可以人工造f，说这个造f的化学反应条件，可以用来评价自然界f形成时候的地壳条件。。。
D选项，说自然界的f，跟人工的f不同（晶格结构不一样）
反驳必然是前提 Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure
(A) Confirming that the shungite genuinely contained fullerenes took careful experimentation. 废话
(B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.
陨石上发现了，说明也可以用这种方法推断陨石的形成时期。（没说这陨石掉地球上了，不会带到地球）
(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.
天然的晶体结构不同说明其产生的环境和
实验室合成的不一样，因此无法推断其产生时期。
(E) Shungite itself is formed only under distinctive conditions. 重复了原文假设，加强了
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |