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  3. Some archaeologists speculate that the Americas might have been initially colonized between 40,000 and 25,000 years ago. However

Some archaeologists speculate that the Americas might have been initially colonized between 40,000 and 25,000 years ago. However

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问题 Some archaeologists speculate that the Americas might have been initially colonized between 40,000 and 25,000 years ago. However, to support this theory it is necessary to explain the absence of generally accepted habitation sites for that time interval in what is now the United States. Australia, which has a smaller land area than the United State, has many such sites, supporting the generally accepted claim that the continent was colonized by humans at least 40,000 years ago. Australia is less densely populated (resulting in lower chances of discovering sites) and with its overall greater aridity would have presented conditions less favorable for hunter-gatherer occupation. Proportionally, at least as much land area has been lost from the coastal regions of Australia because of postglacial sea-level rise as in the United States, so any coastal archaeological record in Australia should have been depleted about as much as a coastal record in the United States. Since there are so many resource-rich rivers leading inland from the United States coastlines, it seems implausible that a growing population of humans would have confined itself to coasts for thousands of years. If inhabitants were present 25,000 years ago, the chances of their appearing in the archaeological record would seem to be greater than for Australia.
The passage is primarily concerned with
选项 A、presenting objection to a claim
B、accounting for an apparent anomaly
C、Outlining an alternative interpretation
D、Correcting a particular misconception
E、Questioning the validity of a comparison
答案A
解析 本文为驳论文，反驳的是第一句的观点。A选项的claim指代第一句的观点。因此A正确。
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