2. 外语
  3. Reliable knowledge of early civilizations of the Americas is 【B1】______ to archeological records, since so much of the 【B2】_____

Reliable knowledge of early civilizations of the Americas is 【B1】______ to archeological records, since so much of the 【B2】_____

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问题     Reliable knowledge of early civilizations of the Americas is 【B1】______ to archeological records, since so much of the 【B2】______ culture was destroyed by early 【B3】______ . Nevertheless, evidence of impressive achievements in monumental 【B4】______ as well as in the art of healing, 【B5】______ , mathematics, and engineering has been 【B6】______ that commands respect as well as 【B7】______ for the loss of this knowledge. In the field of agriculture, these civilizations left a 【B8】______ that has greatly enriched the food of today’s planet. White potatoes, corn, beans, tomatoes, squash, chocolate, tapioca, vanilla, and turkey are just 【B9】______ Lost, however, are the secrets of the Mayan astronomers and the Inca builders as well as many medicinal practices. Perhaps the greatest casualty, however, 【B10】______ . Indians in these civilizations seldom warred with nature; instead, they adapted to it. Our present concern with ecology causes us to 【B11】______.
【B10】
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答案has been the Indian attitude toward life and the universe
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