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  3. This passage is mainly about how the development of airline industry has affecte

This passage is mainly about how the development of airline industry has affecte

游客2024-03-03  99
问题 This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases emission. [br] 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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