请教GWD6-Q32

pangpangshin

GWD6-Q32: Proposal:Carbon dioxide and methane in the atmosphere block the escape of heat into space.So emission of these “greenhouse” gases contributes to global warming.In order to reduce global warming, emission of greenhouse gases needs to be reduced.
Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.

Objection:The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A.Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.

B.The conversion of methane to electricity would occur at a considerable distance from the landfills.

C.The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.

D.Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.

E.The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.

答案选D，不明白C 为什么错了。。。。。

wangliming

这题你再看看D吧，比较有感觉~

c是支持吧

pangpangshin

我是看出D对了 可我不明白C 为什么错了？为什么支持？？？

danni423

LZ确定理解了C讲什么了？

提炼一下，题目是要说M这种气体的坏话，而C在某种不严格的角度上为M说了好话。。。

zhangluE

A.Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.（这不是造成co2的主要原因，无关）

B.The conversion of methane to electricity would occur at a considerable distance from the landfills.（这对排放出的c02数量无影响，无法削弱objection）

C.The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.（以排放二氧化碳为代价，生产电来替代一种并不会导致温室气体产生的燃料，显然是不环保的，支持了objection）

D.Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.（将m=>electricity=>co2，相当于将m转换为co2，co2比m的破坏更小，所以proposal可取，反驳了objection；即使烧掉m会往空气中排入二氧化碳排中也比不燃烧m，直接让乙醇排入空气中好，证明objection 是错误的）

E.The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.（支持了objection,提出了解决污染的另一方法，是对proposal的反对，即对objection的支持）