TT GWD-5-32

zyzcdcdcd

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?

 

1. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
2. The conversion of methane to electricity would occur at a considerable distance from the landfills.
3. 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.
4. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
5. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.

我认为counters the objection made to the proposal表示的就是（双重否定）支持这个proposal因为我感觉proposal里并没有objection..    答案恰恰相反，请NN们指教

zyzcdcdcd

upup

cx1205

以下是引用zyzcdcdcd在2006-9-26 15:36:00的发言：

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?

 

 

1. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
2. The conversion of methane to electricity would occur at a considerable distance from the landfills.
3. 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.
4. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
5. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.

我认为counters the objection made to the proposal表示的就是（双重否定）支持这个proposal因为我感觉proposal里并没有objection..    答案恰恰相反，请NN们指教

我是这么理解的,c和m是使全球变暖的主要原因,为了不让全球变暖,那些grasshouse gas就要减少排放,所以那些垃圾堆放出来的m应该把它燃烧掉,来发电
    

objection就怀疑说:燃烧掉m也会产生c而排放到大气中(就是燃烧c没用,也会是全球变暖)
    

题目问:那一个可以反驳objection(只要说燃烧m不会产生c或不会是全球变暖就可以了)
    

c说,那些用来燃烧发电的m其实是一种燃料的替代品,而这种替代品燃烧不会任何的grasshouse gas(既然m是这种燃料的替代品,就说明用来发电的m在燃烧时也不会产生grasshouse gas,这样就反驳了objection)
    

嘿嘿,不知道理解的对不对,还请高手指点

zyzcdcdcd

谢谢我也是这样想  但是答案是D

cx1205

以下是引用zyzcdcdcd在2006-9-27 9:36:00的发言：

谢谢我也是这样想  但是答案是D

我知道,c可能错了,我加如了自己的想法,c中只说那中燃料不放出 grasshouse gas但没有说他的替代物m燃烧也不放grasshouse gas,所以推不出来燃烧m能减少全球变暖

d说m,对大气变暖更严重,所以把m烧掉产生c在某种意思上说减轻了全球变暖.objection的意思是说燃烧m而产生c,对全球变暖没有帮助.因此d反驳了objection

不行了在说一会自己求要去撞墙了

gmat30

this answer is absolutely D,

methane is more harmful than carbon dioxide in blocking the escapeof heat into space.

so although the burning of mehtane generate carvon dioxide, the effect will be better as a whole.

wanghanwuhan

cx1205 发表于 2006-9-27 01:51
以下是引用zyzcdcdcd在2006-9-26 15:36:00的发言：Q32roposal:  Carbon dioxide and methane in the ...

"when burned" is refering to fuel.

问啊问啊

cx1205 发表于 2006-9-27 01:51
以下是引用zyzcdcdcd在2006-9-26 15:36:00的发言：Q32roposal:  Carbon dioxide and methane in the ...

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. 我一开始也是错选C，但是仔细想一下应该是这样：
题目要求counters the objection，而这个obj是The burning of methane generates carbon dioxide that is released into the atmosphere.。因此答案必须要针对这个objection说事儿。D就很好的针对objection里的CO2是放到空气中做出了反驳，甲烷也放空气中了，但是危害更大。属于直接攻击结论。 而C，说甲烷通常被用作清洁能源的替代品，相比D就逊色很多，既没有提到CO2释放在空气中有害无害（没直接攻击结论），也没有提到引入独立第三因素证明其他可能造成CO2对温室效应无害的原因。再说，C中甲烷用作不产生温室气体的燃料，但是其他应用工况会不会产生温室气体的燃料呢，万一fuel只是唯一的一种清洁情况，那岂不是其他情况甲烷大大的有害，支持了objection？这个fuel的例子太narrow了

直播上700

问啊问啊 发表于 2015-5-1 11:23
The methane that is used to generate electricity would generally be used as a substitute for a fue ...

请问一下
D中加完能有效地阻止热量的排放，这不是反驳了P的观点而支持了O的观点吗?
我理解的O是不支持M燃烧，这里怎么理解呢