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原文：the researchers dismissed demographic bias
because older individuals were not overrepresented
in the fossil samples.
在样本中老年样本没有超出比例。（暗示老年样本和年轻样本牙齿坚固程度不同。）
7. The researchers' conclusion concerning the absence
of demographic bias would be most seriously
undermined if it were found that （要削弱原文观点，即找支持“种群结构因素需要被考虑”的选项）
(A) the older an individual carnivore is, the more
likely it is to have a large number of tooth
fractures （未否定原文中提到的种群结构比例。）
(B) the average age at death of a present-day
carnivore is greater than was the average age at
death of a Pleistocene carnivore （古代与现代比较，未否定古代本身的种群结构比例）
(C) in Pleistocene carnivore species, older
individuals consumed carcasses as thoroughly
as did younger individuals （进食方式描述，原文提到的古代种群结构比例未变动）
(D) the methods used to determine animals' ages in
fossil samples tend to misidentify many older
individuals as younger individuals （错把老的当成年轻的，种群结构比例变化了，因此削弱原文不需要考虑比例因素的观点。）
(E) data concerning the ages of fossil samples
cannot provide reliable information about
behavioral differences between extinct
carnivores and present -day carnivores （化石年代无法确定现代和古代行为方式差异，未提到结构变化，无关）
楼主，是否还有疑问？可以继续讨论哦~~
ps：我现在在做OG13 阅读部分，欢迎指点~~谢谢啦~
http://forum.chasedream.com/GMAT_RC/thread-803070-1-1.html |
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发表于 2013-1-30 19:58:12
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