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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.
Use negation method:
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)
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