2014年12月英语六级仔细阅读答案一-第二套（沪江网校版）

56. D) They are major contributors to environmental problems.
57. C) The desire to generate profits.
58. C) They believe building such a system is too costly.
59. A) It helps businesses to save and gain at the same time.
60. B) They do much better than their counterparts in terms of revenues.