求助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.

我选的c

同问  我也选c  但看看d也是对的

那答案是？

我选D

D

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

这里说燃烧乙醇会产生二氧化碳，D答案明确了“乙醇的温室效应要比二氧化碳强”。 所以即使烧掉这些乙醇会往空气中排入二氧化碳排中也比不燃烧乙醇，直接让乙醇排入空气中好，证明objection 是错误的。

我也选c, 是不是因为methane燃烧肯定会产生co2, c选项与事实不符啊？

C错。 因为它只是支持了proposal，却没有反对objection.然而，题目要求的是能够反驳objection的论据。

obejection认为：“燃烧M会产生更多C，不利于减少温室效应”

而D选项说，不燃烧M比燃烧M更容易产生温室效应。

因此，D正确。