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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.
D，The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.这里yet found指的是在现在的石油里发现的细菌，而题干说的是假设石油是由细菌活动而来，此细菌不是彼细菌。同时题干已经说了假设石油是由细菌活动而来，即默认那些hydrocarbon可以经由细菌活动转化成石油，不再考虑hydrocarbon里是否有充足的细菌使转化发生的问题。
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