仔细阅读答案之选词填空(十五选十)部分：
47. exercise extraordinary power
48. is used in the nation
49. panic in the West
50. foreign oil
51. establish a stockpile of oil
52. They don't know what is going to happen in the future.
53. Its initial blow to confidence far exceeded that of 1929.
54. The government intervened effectively.
55. To curb the fear of a lasting free fall.
56. It has not gone from bad to worse.
57. the sound of a forest signifies its health condition.
58. the collapse of rain forests is caused by direct human interference.
59. turn them into a major source of greenhouse gases
60. Lack of rainfall resulting from global warming.
61. Its practice of burning forests for settlement and development.
