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 gic
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
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