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题库 / GMATLA-CR-20
In the past the country of Siduria has relied heavily on imported oil. Siduria recently implemented a program to convert heating systems from oil to natural gas. Siduria already produces more natural gas each year than it burns, and oil production in Sidurian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Sidurian reliance on foreign sources for fuel should decline soon.
Which of the following is an assumption on which the argument depends?
In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production.
Domestic production of natural gas is rising faster than is domestic production of oil in Siduria.
No fuel other than natural gas is expected to be used as a replacement for oil in Siduria.
Buildings cannot be heated by solar energy rather than by oil or natural gas.
All new homes that are being built will have natural-gas-burning heating systems.
oil 石油 gas 天然气
燃料包括石油和天然气（fuel=oil+gas+...）
P：oil and gas的产量都在增加，且gas的产量比使用还多
C：S过不需要再进口任何燃料
A 取非S国燃料消耗比燃料生产更快-->削弱
读比较结构的时候先提两边的对象！！
C other than 除...以外
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方案：usage and trends in fuel production
目的：reliance on foreign sources for fuel should decline soon
A：在锡杜里亚，燃料消耗量的增长并不比燃料产量的增长快。
直接提到总fuel消耗和产量的供需变化，最综合！其他选项要么片面，要么无关
方案：usage and trends in fuel production
目的：reliance on foreign sources for fuel should decline soon
A：在锡杜里亚，燃料消耗量的增长并不比燃料产量的增长快。
直接提到总fuel消耗和产量的供需变化，最综合！其他选项要么片面，要么无关
a) In Siduria the rate of fuel consumption is rising MORE quickly than the rate of fuel production -> negate the conclusion ( production cannot catch up the demand)
b) Domestic production of natural gas is NOT rising faster than is domestic production of oil in Siduria. (Doens't matter, and if oil production increase, it would actually require less import)
c) FUEL other than natural gas is expected to be used as a replacement for oil in Siduria. (Irrelevant. and if it is, require less import)
d) Buildings CAN be heated by solar energy rather than by oil or natural gas.(Irrelevant, and if it is , less import of oil required)
e) All new homes that are being built will NOT have natural-gas-burning heating systems. ( Irrelevant, how many new homes are there that will affect the total consumption of oil?, the oil consumption by this new homes might remain the same)
A. S的燃料耗慢于产 → √
B. 国内gas和oil对比，无意义
C. 文章重点在用国内资源而非国外资源上
D/E. irrelative
CQ1. 国内的fuel能不能用
CQ2. 国内的需求会不会上升得更快？
和其他energy，生产速度都没有关系
现在的情况是在heating上对fuel的需求已经开始从oil转为gas，且gas供给有余；oil的供给也在稳步上升。
关键就在于，对oil的需求会不会增长过快（比如除heating还有其他需要oil的地方）
而对于oil，由于oil需求的减少，而oil的产出又在不断增加，现在看起来，oil的供应也是充足的；
我们只需要选一个选项，保证其逻辑不出错即可，a选项是对的
choice a, fuel消耗不会比fuel生产更加快。correct。题干只说了目前天然气供大于求，但不知道石油是不是，fuel包括了天然气和石油
fuel usage仅包括natural gas usage
而结论是sources for fuel，所有sources
范围扩大了