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	50. Cells and Temperature 49 Sleep 48 Bacteria 47 Folk Cultures 46.Vision 45.The source of Energy 44.Obtaining Fresh water from icebergs 43.Statistics 42.Coal-fired power plants 41.American black bears 40 Cohesion-tension Theory 39 The Salinity of Ocean Waters 38 Topaz 37 Icebergs 36.Plate Tectonics and Sea-floor Spreading 35.Oil Refining 34 Raising Oysters 33 Plankton浮游生物 32 Botany 31 British Columbia 31 British Columbia 30 The origin of Refrigerators 29 Telecommuting 28.Changing Roles of Public Education 27. Scientific Theories
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