以下是引用关灵韶在2009-6-4 9:27:00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 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D 我觉得D和题目没有关系啊 我认为C对 请大家帮帮忙 第一步，问驳斥 第二步，题干说，尽管F最开始于实验室发现，但它们已经存于自然界很久，以F的形式存于稀缺矿物质S中。因为人造F需要温度和气压的环境，这项发现给予G去评估一个地球的C的假设。 原文很明了，因为实验室有什么，所以顺藤摸瓜自然环境必然有什么 第三步，看选项 A确认S的确含F需要仔细试验，明显残废，杀 B有些。停！感觉不好，留着，出于节省时间的目的，跳过。 C说S自身含有炭，题干提过炭么？从句不看了，扯淡选项。杀！ D自然形成的F是之前的什么水晶体排列的什么东东，我没感觉，揣着吧 E看到only想干掉，削弱不需要这么强的语气词 回头看看B吧 有些F在什么地方的残留物里面发现呢？什么宇宙飞船的碰撞物？？？野马！杀！ 那就D吧 做完 | 
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发表于 2009-6-4 09:27:00
