gwd-6-4 是这么理解吗?

applebees

Q4:

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?

1. In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production.

2. Domestic production of natural gas is rising faster than is domestic production of oil in Siduria.

3. No fuel other than natural gas is expected to be used as a replacement for oil in Siduria.

4. Buildings cannot be heated by solar energy rather than by oil or natural gas.

5. All new homes that are being built will have natural-gas-burning heating systems.

答案为A 将A取非就变成在S燃料的消耗量比生产量增长的要快 这就削弱了文中的结论 文章是说油和天然气的生产都在增长 ？？是这么理解吗?? 不好意思 我的假设题做的特别差 所以想确认一下这题的解题思路 谢谢了

applebees

many  thanks !!![em08]

falcons

Deny A, we get "In Siduria the rate of fuel (i.e. oil) consumption is rising quickly than the rate of fuel production."  If so, and if the gap between oil consumption and domestic production can not be offset by the reduced demand of heating oil, S will still needs to import more foreign oil -- the original argument is weakened.  So, A is a necessary assumption.