英语口语作业air pollution
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Refrigerator
Freon（氟氯昂）
The CFC is not harmful to our bodies and atomosphere. It really true is Fu.
Factories
Many factories are producing plenty of wasted gases. Since the industry revolution in 1760s, People started to use coal and oil vastly. That makes the percentage of carbon dioxide in air rise quickly.
Smoking
We meet smokers everywhere. There are 6.5 billion people in the world, and about 1.2 billion of them are smokers, which make up to 20 percent of the world's total population.
Fog
a major cause of choking smog
Experts are worried that particulate matter in the air, which is in higher concentrations in North China because of the heavy fog since the weekend, may lead to various respiratory diseases including lung infectiห้องสมุดไป่ตู้ns and cancer.