A. can be dwarfed by nature’s output of pollutants
B. can overwhelm the natural system that removes pollutants
C. will damage areas outside of the localized regions
D. will react harmfully with natural pollutants
B
Chọn B.
Đáp án là B.
Giải thích:
Đoạn 3: However, human production usually occurs in a LOCALIZED area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles.
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