求助GWD6-Q32

avivaxy

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

huyuqiao

同问  我也选c  但看看d也是对的

tomzhou

那答案是？

我选D

silent7706

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。

VivienZheng

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？

xfi883

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。

wang691519

C选项里的that修饰的是fuel不是methane，就是说methane替代了一种更好的燃料，这种燃料不产生温室气体，这不就是说methane不好了么？

而题目是要反对objection，支持proposal，既说methane替代 Carbon dioxide是应该的，因此不能选C。

至于正确选项D，4楼说的比较明白，只是应该是甲烷，不是乙醇。

HBS2013

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。

-- by 会员 xfi883 (2009/7/6 15:02:00)

Why D:


The objection attacks the proposal that the burning of methane is useless because methane is gone but CO2 gets generated. Option D counter-attacks saying that although CO2 gets generated, it is better to have CO2 than to have methane, because methane is more harmful. So overall the burning is useful.


Option C repeats the proposal. does not counter the objection, as the question asked.

Karenzz

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. M 被燃烧好。（填埋的方法应该被燃烧发电的方法替代）。

Objection:The burning of methane generates carbon dioxide that is released into the atmosphere.。m 被燃烧不好。（因为要产生二氧化碳）。

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.把m 来燃烧发电，是代替了令外一种完全不会产生温室气体的fuel, 所以燃烧m发电是不好的。

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

M 比二氧化碳产生的温室效应更大，所以说燃烧m虽然产生二氧化碳，但还是好的。

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

richardliu6

我觉得C是无关选项，燃烧m产生二氧化碳，不燃烧m会产生温室效应，proposal和objection argue的就是要不要燃烧m，也就是说是燃烧m产生的温室效应严重还是不燃烧严重，c说把m 来燃烧发电，是代替了令外一种完全不会产生温室气体的fuel，没有讨论燃烧m产生的温室效应严重还是不燃烧严重，所以是无关选项。也没有支持proposal。