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快速阅读 1. C. New explanations for the obesity epidemic. 2. A. gained the least weight 3. B. it causes sleep loss 4. D. It contributes to our weight gain. 5. C. It suppresses their appetite. 6. D. Those who quit smoking. 7. B. the rising proportion of minorities in its population 8. unclear 9. family size 10. partly genetic 简短回答问题 47. lighter and more absorbent 48. the potential in the U.S. 49. established athletic footwear industry 50. informally 51. The team spirit and shared values of the athletes 仔细阅读 52. B. By its sustainability 53. D. the decrease of brodiversity 54. C. They are not necessarily sustainable. 55. A. It will go through radical changes. 56. D. To urge people to rethink what sustainable agriculture is. 57. A. They were of inferior races. 58. B. They can do just as well as their predecessors. 59. D. They may forever remain poor and underachieving. | 
