A. will damage areas outside of the localized regions
B. will react harmfully with natural pollutants
C. can overwhelm the natural system that removes pollutants
D. can be dwarfed by nature's output of pollutants
C
Đáp án C
Thông tin ở đoạn cuối: “In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles.” (human-generated air pollution in localized regions can overwhelm the natural system that removes pollutants)
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