ischaemic heart disease 指（）。

Do you know your cholesterol level？ Many people don't. A high level of cholesterol in the blood is an important risk factor for heart disease. Some people say that the danger of heart disease is exaggerated. However, heart disease is a main cause of death in developed countries. Every year more than one million Americans have heart attacks, and half of them die. People with heart disease suffer chest pains that make simple activities, such as walking, shaving, or taking a shower, difficult. Research has proven that cholesterol levels are connected with heart disease. One project in Massachusetts has studied the same group of men and women since 1948. The researchers have found that the people who have high levels of cholesterol have more heart attacks. A natural substance in the blood, cholesterol comes from the liver. The amount of cholesterol is affected by diet and by physical qualities we inherit from our parents. One kind of cholesterol sticks fat to the walls of arteries, making them smaller and finally blocking them. It produces a condition called "hardening of the arteries," which causes heart attacks. With tiny cameras, doctors can see blood circulating through the heart valves. Angiograms (血管造影照片) are x-rays of the heart arteries. They show fat deposits and blockages caused by high cholesterol. Heart disease begins in children as young as 3 years old. It occurs earlier in boys than in girls. Nearly half of teenagers have some fat deposits on their artery walls. Heart disease develops faster if we have high cholesterol levels and also smoke. What is a safe level of cholesterol？ Adults have a high risk of heart attack if their cholesterol level is above 240 milligrams per deciliter (1/10 公升) of blood. Below-200 is better. In the Massachusetts study, no one with a cholesterol level below 150 has ever had a heart attack. However, about half of American adults have cholesterol levels above 200. To lower our cholesterol level, we must change our eating habits. Anything that comes from an animal is high in fat and high in cholesterol. The American Heart Association National Cholesterol Education Program says that fat should be no more than 30 percent of our diet. Blood cholesterol levels start to fall after 2 to 3 weeks of following a low-cholesterol, low-fat diet. Dietary changes alone can result in a 10 percent reduction of the average person's cholesterol level. Aerobic exercise helps, too. Artery blockage can be reduced by as much as 40 percent through changes in diet and amount of exercise. We must educate everyone, including children in elementary schools. We must teach them responsibility for their health through classes in nutrition and aerobic exercise. For example, the smart snack is fruit. Children must be served fruit in the school cafeteria, along with low-fat meals. Schools must send recipes home with the children. Parents must include children in planning and preparing meals and shopping for food. Adults, including persons over the age of sixty five, can lower their cholesterol by 30 or 40 percent. It is never too late to change. One man began his health program when he was seventy: three. By the time he was seventy-seven, he had lowered his arterial blockage from 50 percent to 13 percent and his cholesterol from 320 to 145 without drugs. He went on a vegetarian diet with only 10 percent fat, plus programs to reduce stress and get more exercise. A low-cholesterol diet that cuts out most animal products and high-fat vegetables may be unfamiliar to people. The Heart Association says to use no added fat of any kind. Don't fry food in oil. Cook it in water, vinegar, or vegetable water. Learn about grains and vegetables. Avoid egg yolks (the yellow-part of the egg). Eat potatoes, beans, low-fat vegetables, and fruit. Peop A．Y B．N C．NG

A．Right B．Wrong C．Not mentioned

One major problem with any【B12】of health risks—especially life-threatening ones is that they【B13】enormously in their immediacy. For instance, AIDS If you get it—will probably be【B14】after a number of years. Cancer induced by smoking or【B15】to radiation, on the other hand, may take 20 to 30 years【B16】its fatal effects show【B17】. In making choices about health risks,【B18】, it is important to bear in【B19】the likely time lag between taking a risk and【B20】its consequences. 【B1】 A．entirely B．chiefly C．exclusively D．mostly

A. Right B. Wrong C. Not mentioned

Its effects are ___16___ those of cocaine and heroin. "No Tobacco Day" is intended for smokers and ___17___ who earn money from tobacco sales. So businesses are urged to stop selling tobacco products for twenty-four hours. ___18___ are urged not to carry advertisements for cigarettes. WHO has approved plans to help reach its ___19___ of a "smoke-free" world. They urge governments to take action to help ___20___ make money by growing other crops. They also call for improved public information campaigns about the risks of smoking. 11题选() A.whether B.which C.when D.what 12题选()A.to chew B.chew C.chewing D.chewed 13题选()A.problems B.questions C.results D.behaviors 15题选()A.difficult B.inconvenient C.worrying D.reasonable 18题选()A.Readers B.Books C.Managers D.Newspapers 20题选()A.Workers B.manufacturers C.farmers D.producers 19题选()A.Objet B.goal C.destination D.direction 14题选()A.at beat B.at most C.at worse D.at least 17题选()A.that B.this C.these D.those 16题选()A.better than B.similar to C.consistent with D.dependent on 请帮忙给出每个问题的正确答案和分析，谢谢！

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The future health of Americans may depend on it. Just this week, a study reported that life expectancy (预期寿命) has fallen or is no longer increasing in some parts of the United States. The situation is worst among poor people in the southern states, and especially women. Public health researchers say it is largely the result of increases in obesity (肥胖), smoking and high blood pressure. They also blame differences in health services around the country. In 2006, a study found that only four percent of elementary schools provided daily physical education all year for all grades. This was true of eight percent of middle schools and two percent of high schools. The study also found that 22 percent of all schools did not require students to take any P. E. (体育课). Charlene Burgeson is the executive director of the National Association for Sport and Physical Education. She says one problem for P. E. teachers is that schools are under pressure to put more time into academic subjects. Also, parents may agree that children need exercise in school. Yet many parents today still have bad memories of being chosen last for teams because teachers favored the good athletes in class. But experts say P. E. classes have changed. They say the goal has moved away from competition and toward personal performance, as a way tp build a lifetime of activity. These days, teachers often lead activities like weight training and yoga. Some parents like the idea of avoiding competitive sports in P.E class. Yet others surely dislike that idea. In the end, schools may find themselves in a no-win situation. Why are schools recommended to give students certain time for sports？ A．Because different schools set up different physical education programs. B．Because the physical activity of children will influence their health in adulthood. C．Because nowadays children spend too much time on their studies. D．Because only four percent of elementary schools provided daily physical education.

A：More

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A．make sense B．make a compromise C．make a pact D．make an analogy between

A．inherited B．driven C．derived D．spread