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In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fi elds is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.
Which of the following would it be most useful to establish in evaluating the argument?
问题:E选项如果有现存的石油加热变成自然气加热的话,石油用的相对少。不是符合原文吗 查看答疑
问题:请问选D是因为heating system 只是用油的一个部分,如果其他方面用油需求上升就还是要进口的,可以理解为考虑不全面吗所以选这个吗?还有就是评价题是不是可以看作支持和驳斥题来做?谢谢老师 查看答疑

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