37 symbol

　　38 decades

　　39 exported

　　40 apparent

　　41 percentage

　　42 combination

　　43 convenient

　　44 Our air quality now suffers from the effects of pollutants emitted directly from our cars.

　　45 The problems caused by motorized vehicles in the West are often magnified in developing nations.

　　46 Movement in some cities comes to a virtual standstill as motorized traffic competes with bicycles and pedestrians.

　　閱讀理解：

　　簡短回答問題

　　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

　　仔細(xì)閱讀

　　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.

　　完型和翻譯：

　　62 C results

　　63 A services

　　64 D from

　　65 C due

　　66 B owners

　　67 D grants

　　68 C unique

　　69 B permission