摘要：56．解析:这是一道主旨题.从第一句it’s likely that everything you learned about American’s ancient is wrong.可知1491这本书主要讲述的是美洲的历史.从后面“-as long as 33000 years ago 和“4000 years ago Mesoamerican farmers- 这两句也可佐证这个结论.

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