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Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade. However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.

Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability?

正确答案: C

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[Helr题库] 求Helr老师指点迷津,两个问题!【大家一起来看看吧!】

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发表于 2014-9-10 15:18:43 | 显示全部楼层 |阅读模式
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Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade.  However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.
Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability?
A. The cost of oil has fallen dramatically.
B. The reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment.
C. Technological changes have increased the efficiency of oil-fired power plants.
D. Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.
E. When the price of oil increases, reserves of oil not previously worth exploiting become economically viable.
1. 由问题问法得知,此题是评估类的题目。
2. 找到前提和结论:
本题又是一个结论与前提相反的题目。这种类型,完全不应该影响我们判断推理模式。让我们解释这个“However”,其实就是削弱本来原文应有的推理。
结论句是:“the threshold of economic viability for solar power should decrease.”
3. 判断推理模式:
通过前提和结论的关系,首先可以排除类比,统计枚举,和方案推理。又由前提与结论发生的逻辑时间,我们可以知道本题是一个从事实向未知推测的一种推理模式。即:当通过技术革新等方式提升了可行性的时候,我们应当可以下调某种东西的经济可行性。所以可知,前提是因,结论是果。所以该题目是因果模式推理。
前提(因)是:“技术进步和器材成本下降令太阳能转化为电能变得更加有效率”
结论(果)是:“太阳能的经济可行性应当上升”
4. 找到答案方向:
因果模式推理有两个CQ:
CQ1:因果概括问题。
CQ2:干扰因素问题。
因果类型的题目,答案选项必须说出一个因的导致结论可信度变化的特点或者是直接涉及到因果之间的联系。
本题其实比较重要的问题是把什么叫经济可行性阈值看懂。阈值本身虽然是一种价格差,但是其本质是成本效益的比较。题目中所给出的经济可行性的阈值表示:“如果令某种方式在经济效益上超过火电,那么火电每桶油需要上升多少钱”。
选项分析:
A. 油价下降了很多。原文中,其实油价是一个量度的标准,真正比较的是经济效益,所以该选项不涉及到因果的联系,不能成为一个因果概括问题。
B. 尽管将太阳能转化为电能的器材原料价格变高,但是这种器材的成本还是下降了。这个选项在解释“因”的一个现象,不是该“因”的特点,不能成为答案。
C. Correct. 技术的革新增加了火电的经济效益。显然这个选项会影响到因果联系,属于一个因果概括问题。属于CQ1:因果概括问题。
D. 大部分的电力是来自于煤电和核电而不是火电的。选项不涉及因果联系和“因”的特点,不是答案。
E. 当油价上涨的时候,有些以前不值得开发的储油地也开始变得值得开发了。该选项说的是火电的成本上升的问题,不涉及因果联系和“因”的特点。


问题1、关于红字部分,怎么才能看懂?这道题就是因为PRICE所以直接锁定A从而把C排除了。
问题2、在用PREP08 HELR老师的分类做题时,要注意区分这道题是属于哪个CQ么?有的时候CQ确定不对,但还是能够选对,这会不会影响到考场做题?




           




 楼主| 发表于 2014-9-10 18:39:34 | 显示全部楼层
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