题目内容
听力原文： Back in those primitive times it was unnecessary to have a special form. of exchange value for everything, like a price. In those times the only things that were really valuable were the skills to survive. But as society became more complex, people depended more on others who were living far away; then it became important for people to develop some method for exchanging value without having to exchange the actual goods.
This need to develop a method for exchanging value was what led to the use of money. Money was a means of exchanging value without having to actually exchange the specific things you wanted. Before the use of money, people had to trade things with each other, and it was usually very difficult to decide what everything was worth in relation to each other. If you had three animals skins and your friend had two pots of dried beans, how did you know how many skins were equivalent to a pot of beans if they didn't have a price？ With the introduction of money, all things could begin to have a common value that everybody could know about. This led to a standardized set of values among people. As the power of money increased, values that were different from the majority were no longer recognized. The value of something in terms of money became the ultimate value. In order for money to function, the whole society has to agree on the same values.
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A．One piece.B．Two pieces.C．Three pieces.D．Four pieces.
听力原文：W: I'm glad that you have decided to take a look. It's a beautiful Property!
M: Yes, it sounds perfect. After I've looked, if I tike it, I will bring my wife. She's having a baby. It's due in the spring, so we will be needing a bigger place before then. The sooner we can sort this out, the better. I want her to relax and not worry about this.
W: A family always needs more space! And of course you don't want her to worry Well, I think that this place is just perfect for a new family. It has 3 bedrooms, 2 bathrooms and a spacious kitchen and living room.
M: How about a garden？ My wife has always imagined a place where she can grow flowers.
W: There is a lovely little back garden, with grass and flowers. Just enough for a small family.
M: That sounds wonderful! She will be ecstatic. How much further is it？
W: Don't worry, It's not too far now. Only a 25 minute drive from our sales office and the traffic on these roads isn't too bad. On a good day you can get there in 15 minutes.
M: Well that is great. My workplace is close to your sales office, so it will be very convenient, no trouble getting to work everyday.
W: Oh, you work near to the office？
M: Yes, in the motor sales company in Million Plaza. Do you know it？
W: Yes, of course! My husband bought a car from you last year. He said that the before-and-after sales service was excellent.
M: That is good news! I'm always pleased to hear about a satisfied customer.
W: I agree. Hopefully after your viewing today, I will have another satisfied customer.
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A．Some rocks.B．Her ticket.C．Her suitcase.D．Her handbag.
Cholesterol and Heart Disease
Do you know your cholesterol(胆固醇) 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 pair/s that make simple activities, such a 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 wails. 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. People often comp
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