简答

　　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.

    更多信息请访问：新浪四六级频道 四六级论坛 四六级博客圈

　　特别说明：由于各方面情况的不断调整与变化，新浪网所提供的所有考试信息仅供参考，敬请考生以权威部门公布的正式信息为准。