53. 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

　　54. The underlined word "modest" in Paragraph 3 most probably means

　　A. relatively high B. extremely low

　　C relatively low D. extremely high

　　55. What can we learn from the text?

　　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.

　　56. The author's purpose of writing the text is most likely to

　　.

　　A. inform B. persuade C describe . D. entertain

　　【考点】说明文

　　【文章大意】吃太多高脂肪的食物，运动太少，吸烟可引发心脏疾病。但还有另一个因素improve environmental air quality but could also become necessary to protect public health.”。由此可推测，D选项内容符合题意。因此，正确答案为D选项。

　　【难度】一般

　　56.【答案】A

　　【试题解析】浏览全文，作者写这篇文章的目的实际上就是为了告之人们心脏病与空气质量之间的关系，A选项符合题意。因此，正确答案为A选项。

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