Q29:
The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law. New
coal-burning plants usually comply with the law by installing expensive equipment to
filter sulfur dioxide from their emissions. These new plants could save money by
installing instead less expensive cleaning equipment that chemically removes most sulfur
from coal before combustion.
Which of the following, if known, would be most relevant to evaluating the claim above
about how new coal-burning plants could save money?
A. Whether existing oil-burning plants are required to filter sulfur dioxide from their
emissions
B. Whether the expense of installing the cleaning equipment in a new plant is less
than the expense of installing the cleaning equipment in an older plant
C. Whether the process of cleaning the coal is more expensive than the process of
filtering the emissions
D. Whether lawful emissions of sulfur dioxide from coal-burning plants are
damaging the environment
E. Whether existing plants that use the filtering equipment could replace this
equipment with the cleaning equipment and still compete with new plants that
install the cleaning equipment
ans：B mine C？
i think C is the best answer
the passage told us that there are two methods to prevent the emission of sulfur dioxide and that to remove the pollution chemically is less expensive for new plants than to filter it.
we are asked to identify how new plants could save money
A 、B、D and E are obviously irrelevant to the question
这个题目应该是哪个答案呢？我怎么也觉得是C合适点呢。
看B
B. Whether the expense of installing the cleaning equipment in a new plant is less
than the expense of installing the cleaning equipment in an older plant
只是说出新PLANT和旧PLANT的安装费用对比，突出的是新旧厂，这个也不能说明结论啊，请教NN噎。。。。
choose C. it compared the expense of process of cleaning the coal and the process of
filtering the emissions , which are refered in the passage above.
why not choose "e"? I think "E" is the most suitable answer because it includes not only the cost but also something relevant to the whole competitive advantage.
想了想E也许是不对,因为问题和选项不搭边
Q29:
The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law. New
coal-burning plants usually comply with the law by installing expensive equipment to
filter sulfur dioxide from their emissions. These new plants could save money by
installing instead less expensive cleaning equipment that chemically removes most sulfur
from coal before combustion.
Which of the following, if known, would be most relevant to evaluating the claim above
about how new coal-burning plants could save money?
A. Whether existing oil-burning plants are required to filter sulfur dioxide from their
emissions
B. Whether the expense of installing the cleaning equipment in a new plant is less
than the expense of installing the cleaning equipment in an older plant
C. Whether the process of cleaning the coal is more expensive than the process of
filtering the emissions.
我认为选b .
请看c里的两个过程是怎么说的“the process of cleaning the coal" and "the process of filtering the emissions" coal 是煤，清除煤的过程？清除了煤工厂也要倒闭了，因为就是以燃烧煤的工厂，题干是说removes most sulfur from coal before combustion----在煤燃烧前除掉硫磺。. 这是两个概念；而”过滤emission“也和题干“filter sulfur dioxide from their emissions”是两个不同的过程，C项不仔细看以为是对的。其实不对。
E是无关选项，题目用虚拟语气说“could have save money”说如果换了，就省钱，和E的内容没关。
B项过于简单，但是没有更合适的答案了。
答案为C.
A.existing oil-burning plants 无关
B.in an older plant 无关比较
D.DAMAGING EVIRONMENT无关
E.同A.
我这里得答案就是c啊，大家哪里得答案啊?
评价：一些碳工厂通过建造贵得转化排放物得仪器达到净化－》这种措施便宜，因为另外那种净化其在燃烧前就除去了很多得碳。：gap 排放物净化过程不贵
C!!
这题大概可以这样理解：
本题背景信息：要减少the emission of sulfur dioxide，有两个措施filtering OR cleaning（意为清洗）。
现在法律限制The emission of sulfur dioxide，新建的电站通常通过安装昂贵的filter equipment来达到法律的要求；作者提出，为了达到为新电站省钱的目的，可以（不安装filter equipment而）安装便宜些的cleaning equipment。（注意原文中的usually、could和instead，它们是理解文章的关键）
LOR：不安装贵的filter equipment而安装便宜的cleaning equipment，所以能省钱。
这里有两个assumption：1）两种装置单独都能达到法律要求的效果；2）没有其他因素导致cleaning equipment比filter equipment花费更多。
题目问：most relevant to evaluating the claim above about how new-coal burning plants could save money（这题绝对没有将新plants与旧plants进行比较的意思，而是在argue如何如何才能让新plants省钱）
A 提到existing oil-burning plants，无关。因为原文在讨论的是new-coal burning plants怎么做才能省钱。
B 将a new plant与an older plant安装cleaning equipment的费用进行比较，无关。因为原文在讨论的是new-coal burning plants怎么做才能省钱。
C 将清洗过程的费用与过滤过程的费用进行比较，恰好是第2个assumption
D 是否破坏环境，无关
E 讨论existing plants怎么做才能达到和新plants一样的效果，无关。因为原文在讨论的是new-coal burning plants怎么做才能省钱。
本题纯粹是阅读题，思维定式会遮住你的眼睛；我也做错了，郁闷哪。
谢谢leonchan的解释
支持C
这题和CD22-V-11中的T-3-Q3 异曲同工：
改良棉花是否经济上对农民有利？答案是：普通棉花用的杀虫剂贵！
小结：比较A、B两者的经济利益问题时，答案会围绕“钱”做文章，会涉及价格多/少、上升/下降；
同意罗马青年
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