题目信息
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?
A:In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production.
B:Domestic production of natural gas is rising faster than is domestic production of oil in Siduria.
C:No fuel other than natural gas is expected to be used as a replacement for oil in Siduria.
D:Buildings cannot be heated by solar energy rather than by oil or natural gas.
E:All new homes that are being built will have natural-gas-burning heating systems.
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正确答案：
A:In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production.
A中：燃料消耗不大于生产。取反，燃料消耗大于生产，而题干中已经提到gas是生产大于消耗，所以oil肯定消耗大于生产，故削弱结论人们依赖oil减少。假设题取反削弱，A是答案。
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