Question

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 cause heart attack or stroke（中风） within as little as a few hours after exposure. In one report 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. Another 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 certainly modest 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.

1. The text mainly discusses the relationship between _________.

A. heart problems and air quality B. heart problems and exercising

C. heart problems and smoking D. heart problems and fatty food

2. The underlined word “modest” in Paragraph 3 most probably means _________ .

A. relatively high B. extremely low

C. relatively low D. extremely high

3. We can learn from the text that __________？

A. eating fatty food has immediate effects on your heart.

B. the EPA conducted many studies on air quality.

C. moderate air quality is more harmful than smoking.

D. stricter regulations on pollutants should be made.

4.The author’s purpose of writing the text is most likely to _________ .

A. inform B. persuade

C. describe D. entertain

Answer 1

1.A

2.C

3.D

4.A

【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。

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。

2.2】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。

3.3】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。

4.4】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