stroke (中风）within as little as a few hours after exposure. In one review 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. 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 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.

29. 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

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

A. relatively high B. extremely low C. relatively low D. extremely high

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

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

　　 D

　　For many years, I was convinced that my suffering was due to my size . I believed that when the weight disappeared, it would take old wounds , hurts and rejections with it .

　　Many weight-conscious people also mistakenly believe that changing our bodies will fix everything. Perhaps our worst mistake is believing that being thin equals being loved , being special , and being cherished . We fantasize about what it will be like when we reach the long-awaited goal .We work very hard to realize this dream . Then , at last , we find ourselves there .

　　But we often gain back what we have lost . Even so , we continue to believe that next time it will be different . Next time , we will keep it off . Next time , being thin will finally fulfill its promise of everlasting happiness , self-worth , and , of course , love .

　　It took me a long while to realize that there was something more for me to learn about beauty . Beauty standards vary with culture . In Samoa a woman is not considered attractive unless she weighs more than 200 pounds . More importantly , if it's happiness that we want , why not put our energy there rather than on the size of our body ? Why not look inside ? Many of us strive hard to change our body , but in vain . We have to find a way to live comfortably inside our body and make friends with and cherish ourselves . When we change our attitudes toward ourselves , the whole world changes .

32．The passage tries to tell us the importance of___________.

A．body size B．different beauty standards

C．culture difference D．attitudes toward life

33．What does the word "everything" in paragraph 2 mean ?

A．The whole world B．All the properties(财产） .

C．All the problems . D．The absolute truth .