天山-3－29

winners

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？

qwrersaa

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

topway5

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

WTO

安装费是一次性的，是小头。就算cleaning装置装起来多花些钱也多不到哪里去。
何况cleaning装置还比filter装置便宜。装置本身的费用显然是要比安装的费用多的。
这些都是经济生产里的常识。

真正决定了能不能省钱的往往是设备装好后的日常运行费用。