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Language and Migration 题目： The study of language can offer important clues about the historic migration of people around the world. Most historians would place the emergence o...

The Global Industrial Revolution   题目：   In fewer than a hundred years, the global process of industrialization utterly transformed Great Britain, most of continenta...

  Agricultural Practices of the Maya   题目：     The Maya civilization flourished for centuries on the Yucatan Peninsula and other areas of Mesoamerica, reac...

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题目： Submerged Plant Life:Surviving Underwater   Whereas a land plant expends a great deal of energy on the production of roots that can forage in the soil for vital water ...

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The Origin of Flight in Birds 题目： Debate over avian origins was stimulated in 1861 when the 150-million-year-old fossil of a bird-like creature was unearthed. Called Archaeopt...