2. 外语
  3. Peoples occupied North America before the arrival of the 【M1】______ European in the 15th century have long been known

Peoples occupied North America before the arrival of the 【M1】______ European in the 15th century have long been known

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问题    Peoples occupied North America before the arrival of the       【M1】______
   European in the 15th century have long been known as Indians because        【M2】______
   of the belief prevalent at time of Columbus that the Americas were the      【M3】______
   outer reaches of the Indies. Most scholars agree that Native Americans
   came into the Western Hemisphere from Asia by the Bering Strait in a        【M4】______
   series of migrations. From Alaska they spread to the east and south.        【M5】______
   Several separate waves of migration are said to count for the many native   【M6】______
   linguistic families, while the common origin used to explain the physical   【M7】______
   characteristics that Native Americans have in common--Mongoloid
   features, coarse, straight, black hair, dark eyes, sparse body hair, and
   a skin colour range from yellow-brown to reddish brown. Many scholars       【M8】______
   accept evidence of Native American existence in the Americas back more
   than 25,000  years.  In  pre-Columbian  times  the  Native  American
   population of the area north of Mexico is estimated to be between one and   【M9】______
   two million. From prehistoric times until recent historic times there were
   roughly about six major cultural areas, excluding that of the Arctic i. e. ,【M10】______
   Northwest Coast, Plains, Plateau, Eastern Woodlands, and Southwest.
   Information about particular groups can be found in separate articles and in
   separate biographies and subject articles.
【M4】
选项
答案by—改成via
解析 via在这里的意思是“经过，通过”。
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