Choose the best answer to complete the sentence.
Heavy traffic flow is a major source of noise ______ in urban areas.
polluting
pollute
polluted
pollution
pollute (v): gây ô nhiễm
polluted (adj): bị ô nhiễm
pollution (n): sự ô nhiễm
Cụm từ: noise pollution (ô nhiễm tiếng ồn)
=> Heavy traffic flow is a major source of noise pollution in urban areas.
(Lưu lượng giao thông lớn là một nguyên nhân chính gây ô nhiễm tiếng ồn ở các khu vực đô thị.)
Đáp án : D
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