1. 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 following, if true , gives us the strongest support to the argument above about our oil reserves?
A. Ancient seas are buried within the Earth at many places where fossils are abundant.
B. The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.
C. 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.
Answer :C
不了解为何是C
2. The wild mouflon sheep of the laceType>islandlaceType> of laceName>CorsicalaceName> are direct descendants of sheep that escaped from domestication on the island 8000 years ago. They therefore provide archaeologists with a picture of what some early domesticated sheep looked like, before the deliberate selective breeding that produced modern domesticated sheep began.
The argument above makes which of the following assumptions?
A. Modern domesticated sheep are direct descendants of sheep that were wild 8000 years ago.
B. Mouflon sheep are more similar to their forebears of 8000years ago than modern domesticated sheep are to theirs.
C. . The climate of Corsica has not changed at all in the last 8000 years.
Answer B
为何不是A | 
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发表于 2004-12-3 18:24:00
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