2. 外语
  3. The primary purpose of the passage is to______ The researchers’ conclusion concerning the absence of demographic bias would be

The primary purpose of the passage is to______ The researchers’ conclusion concerning the absence of demographic bias would be

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问题 The primary purpose of the passage is to______
The researchers’ conclusion concerning the absence of demographic bias would be most seriously undermined if it were found that______
选项 A、the older as individual carnivore is, the more likely it is to have a large number of tooth fratures
B、the average age at death of a present-day carnivores is greater than was the average age at death of a Pleistocene carnivore
C、in Pleistocene carnivore species, older individuals consumed carcasses as thoroughly as idd younger individuals
D、the methods used to determine animals’ ages in fossile samples tend to misidentify many older individuals as younger individuals
E、data concerning the ages of fossil samples cannot provide reliable information about behavioral differences between extinct carnivores and present-day carnivores
答案D
解析 This question asks you to identify a statement that would undermine the researchers’ conclusion regarding demographic bias. The researchers concluded that demographic bias was not a factor because older individuals were not disproportionately represented among the fossils. The implication of this conclusion is that older individuals might be expected to have a higher rate of tooth breakage. The best answer is D. The researchers’ conclusions with regard to the demographic bias are depended upon reliable information about the age of the individuals in the fossil samples. If there were a demographic bias-in this case, a preponderance of older individuals-in the fossil samples, the misidentification of older individuals as younger ones would have concealed the bias from researchers. Choice A is not correct. The researchers’ conclusions imply that older individuals might be expected to have a higher rate of tooth breakage. Findings that confirmed this would not undermine the researchers’ conclusions that the samples were representative. The information in choice B, C and E is irrelevant to the issue of whether older individuals were disproportionately represented among the fossil sample.
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