OG 74

tclj

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 Malvernia fields is increasing at a steaty pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decilne soon,
Which of the following would it be most useful to establish in evaluatiing the argument？
A. When, if ever, will production of oil in Malvernia outstrip production of natural gas?
B.Is Malvernia among the countries that rely most on imported oil?
C.What propotion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?
D.Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?
E.Have any exsiting oil-burning heating systems in Malvernia already already been converted to natural gas-burning heating system?

原文不是说fuel的usage不会变的吗？难道是这样理解：trend只表示方向，不表示大小？？

bobdog159

usage个人理解为指的是 conver heating systems from oil to natural gas。也就是说，使得取暖系统由使用oil转变为使用natural gas的这个用法不变，并不是使用oil 和 natural gas的方法不变。不知道这么解释楼主能否理解。


附上原文推理：

真实情况:Oil 产量不变，natural gas产量远远大于需要。Heating systems 现在改用natural gas
隐藏假设前提：oil仅仅用于heating systems
推理结论：不用进口oil
假设漏洞：oil其实还有很多其他用途

E选项之所以对就是指出逻辑漏洞，其实oil还是有很多其他用途，不仅仅是用于heating systems

tclj

哦，谢谢了，我懂了，我理解成它每年的总的用量不变了.....usage是用法的意思...谢谢