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经典真题300篇 -8950【medium】 00:00:00 关闭计时
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Findings in biological anthropology suggest that Native Americans’ ancestors probably came to the Americas from northeastern Asia. Turner, for example, has studied the dentition of prehistoric and living Native Americans and northeastern Asians. Based on approximately twenty dental traits, including tooth-crown shape and number of roots, he has defined an overall dental pattern called Sinodonty, which includes three-rooted lower first molars and shovel-shaped incisors. This distinctive pattern is shared among most Native Americans and people from northeastern Asia, but is not found in people who originated in southern Asia, Africa, or Europe. Another less complex pattern—Sundadonty—is shared among the people of southeastern Asia and is also found in prehistoric American populations, but Turner believes that widespread Sinodonty demonstrates most Native Americans’ northeastern Asian origins. 

The passage implies that Turner’s conclusion regarding the origins of most Native American  populations is based in part on which of the following findings?

正确答案: BC 耗时:
该题平均耗时:2分21秒 ,平均正确率:52 %。 该题由网友lgw20422提供。更多GRE题目请 点击上传

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  • 当前版本由371524c更新于2020-04-22 16:33:48 感谢由371524c对此题目的解答所做出的贡献。

    答案:BC。多选题。

    根据题干定位到Sinodonty,“he has defined an overall dental pattern called 

    Sinodonty, which includes three-rooted lower first molars and shovel-shaped incisors.(此处对应B )This distinctive pattern is shared among most Native Americans and people from northeastern Asia, but is not found in people who originated in southern Asia, Africa, or Europe. ”得出答案C。

    A选项错,因为Sundadonty并不是Turner的发现。

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