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题库 / GMATAdvanced-CR-35
Biologist: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges. The broader a species’ range, the more likely that species is to survive the extinction of populations in a few areas. Therefore, it is likely that the proportion of species with broad ranges tends to gradually increase with time.
The biologist ’s conclusion follows logically from the above if which of the following is assumed?
There are now more species with broad geographic ranges than with narrow geographic ranges.
Most species can survive extinctions of populations in a few areas as long as the species’ geographic range is not very narrow.
If a population of a species in a particular area dies out, that species generally does not repopulate that area.
If a characteristic tends to help species endure longer, then the proportion of species with that characteristic tends to gradually increase with time.
Any characteristic that makes a species tend to endure longer will make it easier for that species to survive the extinction of populations in a few areas.
错选了C.
其实把C取反，如果某一物种在一个地方灭绝了，这个物种可以在这个地方重新繁衍。取反之后不能削弱结论
可以重新繁衍不意味着不会重新灭绝——一样的，但是D取非，活得长的特质如果不会增加的话，那活得长的永远只有一点点人，死了就没有了，就不能说porportion逐渐增加了
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