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.

　　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________.

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