仔細(xì)閱讀答案之選詞填空（十五選十）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.