1. 硫化物污染大气，降低能见度；
2. 导致酸雨的产生，进而damage crops；
3. 对人类健康有不好的影响，e.g.: breathing problem
听力要点
教授觉得passage的叙述太过exaggerated。
1. 硫化物prevents sunlight from heating the earth, cool the earth,舒缓全球暖化；
2. 二氧化硫不是主要造成酸雨的因素，是NO3(氮化物)；
3. 硫化物不是唯一危及人类健康的因素，仍有其它因素，硫化物只加重病情的恶化。
范文
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