2. 外语
  3. This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases e

This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases e

admin2009-09-12  56
问题 This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases emission.
Although aviation accounts for only 3% of the total man-made emission, its______ are believed to be disproportionately damaging to the environment.
选项
答案high-altitude emissions
解析 答案在第三部分第二段开头。
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大学英语四级

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