Eating too much fatty food，...

【答案】【小题1】A【小题2】C【小题3】D【小题4】A【答案解析】试题分析：本文主要讲述了另一个导致心脏疾病的因素---空气质量，并客观地呈现了两个长期暴露于污染的环境下健康研究。【小题1】细节理解题。根据第一段But there is another factor that can cause your heart problems more immediately：the air you breathe.得知本文主要讲空气质量和心脏疾病的关系。选A。【小题2】词义猜测题。根据第三段The authors of both studies stress that these risks are relatively small for healthy people and certainly modest compared with other risk factors such as smoking and high blood pressure.得知这些风险对健康的影响与吸烟和高血压相比相对较小。A. relatively high 相对来说高B. extremely low 极其低C. relatively low 相对来说低 D. extremely high极其高。选C。【小题3】推理判断题。根据最后一段So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health.得知环保部门应该建立更严格的规章制度来约束污染物，改善空气质量。选D。【小题4】作者态度题。本文作者客观地呈现了两个研究，是起到告知的作用。选A。考点：科研类文章