科普知识类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is another factor that can cause your heart problems more immediately: the air you breathe.

　　Previous studies have linked high exposure (暴露) to environmental pollution to an increased risk of heart problems, but two analyses now show that poor air quality can lead to heart attack or stroke (中风) within as little as a few hours after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物) were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of “moderate” (良好) quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14 hours of exposure.

　　The authors of both studies stress that these risks are relatively small for healthy people and certainlymodest compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health.

【2016届高考英语二轮复习阅读理解七十五十集之连载训练：（73）】相关文章：

★ 2017届高考英语二轮复习课时训练：12（含解析）

★ 2014高考英语（新人教版）一轮基础训练（2）A、B卷（附答案或解析）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习完形填空专题训练：技法2 利用语义逻辑关系解题（含解析）

★ 2017届高考英语二轮复习书面表达限时测验：3（含解析）

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练四

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之夹叙夹议文：考纲分析（含解析）

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（15）附答案

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（5）附答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (70)

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：模式2 多一词（含解析）