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阅读理解

　　People and the sources of air pollution are found in the same places．This means that cities with large populations have the biggest problem of dirty air．Air pollution is caused by many different things．A major source of air pollution is the gas fumes from cars．Statistics show that 93 percent of all auto trips are within cities．Another major source of dirty air is the burning of coal and oil for energy．This energy is needed to make electricity．Of course, much more electricity is used in the city than in the country．

　　On the average, we throw away more trash and garbage than the year before．The burning of garbage contributes to air pollution．Many major industries are also responsible for the dirty air in the around cities．The fumes from iron, steel, chemical, and petroleum production add particles to the air．

　　The effects of air pollution range from mild headaches to death．The levels of pollution found in heavy for traffic may cause headaches for loss of clear vision．Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode．In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death．

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阅读理解，阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　Below is some advice on how to prevent cancer：

　　Aside from being a healthy and delicious snack, blueberries contain pterostilbene, which has important colon(结肠)cancer-fighting prosperities．But wait, it gets better．Blueberries also offer a large dose of vitamins C(14 milligrams per cup)．So at breakfast, try to take in a cup and a half of blueberries in your cereal or yogurt, or mixed with other berries．

　　2．Drink Pomegranate(石榴)Juice

　　The deep red juice of the pomegranate contains polyphenols, isoflavones and ellagic acid, which together create a powerful anticancer mixture．Most recently, researchers from the University of Wisconsin at Madison has discovered that 16 ounces of pomegranate juice per day also may inhibit the growth of lung cancer．

　　3．Relax

　　Feeling stressed or worried? Find ways to relax and you may reduce your chances of developing cancer．Purdue University researchers tracked 1, 600 men over 12 years and found that half of those with high levels of worry died during the study period．Only 20 percent of the optimists died before the study were completed, while 34 percent of the extremely anxious men died of some type of cancer．Instead of stressing about the past or future, focus on the present and relax!

　　4．Take Selenium(硒)

　　Selenium is well known for its cancer-fighting properties．In a study of almost 1, 000 men, researchers from the Journal of the National Cancer Institute found that when men with the lowest initial levels of selenium in their bodies received a daily supplement over a 4 year period, they cut their prostate(前列腺)cancer risk by a remarkable 92 percent．However, it is possible to get too much of a good thing, so monitor your intake of selenium-containing supplements, Brazil nuts, tuna, meats and grains carefully．

　　5．Eat Sushi(寿司)

　　Seaweed may not be your idea of a great snack, but it is high in fiber, calcium and iron, and dry, roasted seaweed sheets used in sushi provide the additional benefits of vitamins A and C．Sushi rolls are also high in protein-a typical spicy tuna roll has only 290 calories but packs 24 grams of protein．So don't skimp(节省)on the Sushi!

　　6．Enjoy the Outdoors

　　Vitamin D causes early death of cancer cells．A study published in the American Journey of Clinical Nutrition reported that women who supplemented their diets with 1, 000 international．Units of vitamin D every day had a 60 percent to 77 percent lower incidence of cancer ever a four-year period that did women taking a placebo(无效对照剂)．Experts recommend supplementing your fun in the sun with 1, 100 to 2, 000IU of vitamin D each day．

　　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)than 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．

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