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题库 / GMATAdvanced-CR-6
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?
Most geologists think optimistically about the earth’s reserves of oil.
Most geologists have performed accurate chemical analyses on previously discovered oil reserves.
Ancient seas are buried within the earth at many places where fossils are abundant.
The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.
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.
1. 大多数地理学家认为石油是由hydrocarbon化学转化而来，这种hydrocarbon是从埋葬在古海底的有机物转化的（A过程）
2. 假设石油实际上是由对其他埋在地球里的复杂hydrocarbons进行细菌活动而来（B过程）
3. 众所周知，2里面的复杂hydrocarbons远超过埋葬的有机物体量
4. 所以，我们的石油比大多数地理学家认为的要多
P：B过程产出石油用的原料比A过程产出石油用的原料多
C：B过程产出的石油产量比A过程产出量高
flaw：B的转化效率可能比A低，故B的石油产出量可能小于A的产出量
E：A过程B过程的转化效率一致
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