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.
60. C. Prevent them from being marginalized.
61. B. how to help immigrants to better fit into American society.
