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

游客2023-07-31  21

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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