题目内容
（请给出正确答案）
提问人：网友f******g
发布时间：2022年4月14日 23:13
[单项选择题]
People all over the world today are beginning to hear and learn more and more about the problem of p...The main cause of pollution is______.
A. the release of artificial or natural substances into the environment
B. the production of new industrial goods
C. increased amounts of a natural substance
D. our ever-increasing population
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