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.
【M7】
选项
答案common origin∧used to—加入is
解析 根据上下文，须用is used to，表示“被用来．．．．．”。
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