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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
