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题库解析   >   削弱题型   >  
    本题由lindy提供
720次学习

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.


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答案:
D
削弱题原因
:fullerenes 要求特别温度和湿度 结论:this discovery可以检测state of the earth's crust at the time fullerenes were formed. 正确答案作用:此discovery对于检测the state of Earth's crust at the time fullerenes没有用 思考:1. 回溯原因:"discovery有没有用"一定与fullerenes相关,因为本题的最根本原因就是fullerenes. 因此一定是fullerenes让this discovery不能来检测地壳状态;选项分析E: 没有提到fullerenes,干掉!; B: 有模糊词some,然而文章结论无绝对词,干掉!; C: fullerenes是如何形成的,跟检测the state of earth's crust无关; A: 是迷惑的选项。confirming矿石含有fullerenes 需要仔细实验,说明要在矿石中发现fullerenes挺麻烦,但是并不能说明发现fullerenes会对检测fullerenes产生影响; D: fullerenes晶体结构我们不知道,无法从它来了解the state of earth's crust. 正确答案!知识点:确认原因结论,回溯原因,模糊词汇

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