【正文】
big social problem. 5. 燃燒煤和汽油污染大氣,也有害于我們的健康。 Burning coal and oil pollutes the air, and it our health . 參考答案: 一 . 1. plas 2. pressure 3. create 4. blood 5. coal 二 . 4. A 5. B 三 . 1. high blood pressure 2. realize。 are breathing 3. develop。 industry 4. With the development of industry 5. is harmful to。 as well