Eating too much fatty food, exercising too little and smoking can raise your fut

Eating too much fatty food, exercising too little andsmoking can raise your future risk of heart disease. But there is anotherfactor that can cause your heart problems more immediately: the air youbreathe.

Previous studies have linked high exposure (暴露）to environmental pollution to an increased risk ofheart problem, but two analyses now show that poor air quality can lead toheart attack or stroke (中风）within as little as a few hours afterexposure. In one review of the research, scientists found that people exposedto high levels of pollutants (污染物）were up to 5% morelikely to suffer a heart attack within days of exposure than those with lowerexposure. 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 raisethe risk of stroke as much as 34% within 12 to 14 hours of exposure.

The authors of both studies stress that these risksare relatively small for healthy people and certainly modest comparedwith other risk factors such as smoking and high blood pressure. However, it isimportant to be aware of these dangers because everyone is exposed to airpollution regardless of lifestyle choices. So stricter regulation by the EPA ofpollutants may not only improve environmental air quality but could also becomenecessary 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 mostprobably means ______ .    

A. relatively high                                          B.extremely low

C. relatively low                                               D.extremely high

3. What can we learn from the text?

A. Eating fatty food has immediate effects on yourheart.

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 mostlikely to _______.

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

试题答案

【答案】

1.A

2.C

3.D

4.A

【解析】

试题