7. Breathe Clean Air

　　There’s no question that secondhand smoke kills. A recent American Journal of Public Health study showed that nonsmokers working in smoky places had three times the amount of carcinogen（致癌物质） in their urine（尿） that nonsmokers working in smoke-free locations. What’s worse, their levels of the carcinogen rose 6 percent for every hour worked. Nine states have banned smoking in all workplaces, bars and restaurants. The message is clear: Do whatever you can to avoid the cloud of smoke.

　　8. Break a Sweat

　　Even a small amount of exercise can offer major cancer-fighting benefits. In a study of 29,110 men published in the International Journal of Cancer, men who exercised just once a week had a percent lower risk of metastasis(转移性) prostate cancer than men who didn’t work out at all. The better the frequency, duration and intensity of the exercise, the bigger the reduction in risk, according to the study.

　　5. To prevent yourself from catching colon cancer, you should eat ____ as often as possible.

　　A. sushi

　　B. blueberries

　　C. pomegranates

　　D. Vitamin D

　　6. A person is very likely to catch some type of cancer if ______.

　　A. he is very fond of exercise every day.

　　B. he is addicted to smoking

　　C. he is always feeling extremely stressed or worried

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