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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.
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当前版本由 371524c 更新于2020-04-22 16:35:00 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，B选项对应“Another less complex pattern—Sundadonty”，C选项对应“Turner believes that widespread Sinodonty demonstrates most Native Americans’ northeastern Asian origins. ” 选项中”occurs frequently”是widespread的同义改写。
A选项错，这个是二者的共同点。
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(如果对题目有任何的疑惑，欢迎在这里提出来，大家会帮你解答的哦~)
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Orange Ao
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可怎么看都觉得c有点牵强哇。。整篇文章在讨论prehistoric的研究，“his distinctive pattern is shared among most Native Americans and people from northeastern Asia, but is not found in people who originated in southern Asia“，，，通过”shared among most Native Americans“硬推真的很疑惑。。。
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c选项对应原文“has studied the dentition of prehistoric and living Native Americans and…”中的living
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我们要努力
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has studied the dentition of prehistoric and living Native Americans ...
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