大全12-19

gracezz · 发表于 2010-4-29 14:20:27

Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose, instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.
Which of the following, if true, gives the strongest support to the argument above about our oil reserves?
(A) Most geologists think optimistically about the Earth’s reserves of oil.
(B) Most geologists have performed accurate chemical analyses on previously discovered oil reserves.
(C) Ancient seas are buried within the Earth at many places where fossils are abundant.
(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.（E）
(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.

请大家看看这个题

conniequan · 发表于 2010-4-29 14:48:46

题目中说the volume of these hydrocarbons exceeds that of buried organisms，然后结论是our oil reserves would be greater than most geologists believe.中间的推理缺少一个条件，也就是同样volume的hydrocarbons和buried organisms，hydrocarbons通过chemical transformations至少（大于等于）能产生和等volume的buried organisms所产生等量的oil ，E选项正好是提供了相等这个条件

gracezz · 发表于 2010-4-29 15:35:09

谢谢楼上，我明白这题的思路了

是这样的意思是吧：

一：从被埋的organism的化学转化过程来
二：从细菌对其他的碳化物的作用过程来
因为other 碳化物>被埋的organism---->油量比预想的大

问支持：

这两种方法对两种碳化物占其总存量的比例相同，那样因为二的存量大于一，那就说明油量也大。。。。。

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