【正文】 us ways in which individual economic units can interact with one another. Three basic ways may be described as the market system, the administered system, and the traditional system. In a market system individual economic units are free to interact among each other in the marketplace. It is possible to buy modities from other economic units or sell modities to them. In a market, transactions may take place via barter or money exchange. In a barter economy, real goods such as automobiles, shoes, and pizzas are traded against each other. Obviously, finding somebody who wants to trade my old car in exchange for a sailboat may not always be an easy task. Hence, the introduction of money as a medium of exchange eases transactions considerably. In the modern market economy, goods and services are bought or sold for money. An alternative to the market system is administrative control by some agency over all transactions. This agency will issue mands as to how much of each good and service should be produced, exchanged, and consumed by each economic unit. Central planning may be one way of administering such an economy. The central plan, drawn up by the government, shows the amounts of each modity produced by the various firms and allocated to different households for consumption. This is an example of plete planning of production, consumption, and exchange for the whole economy. In a traditional society, production and consumption patterns are governed by tradition。 A It is obvious that doctors recognize obesity as a health problem. So why is it so hard for them to talk to their patients about it? The results of two surveys, one of primary care physicians and the other of patients, found that while most doctors want to help patients lose weight and think it is their responsibility to do so, they often don’ t know what to say. “ So while doctors may tell patients they are overweight, the conversation often ends there,” said Christine C. Ferguson, director of the Stop Obesity Alliance. “ Patients are not told about the possibility of diabetes (糖尿病 ),” she said. “ And doctors don’ t feel they have good information to give. They felt that they didn’ t have adequate tools to address this problem. The lack of dialogue hurts patients, too. The patient survey, of over 1,000 adults, found that most overweight patients don’ t even know that they’ re too heavy. Only 39 percent of overweight people surveyed had ever been told by a health care provider that they were overweight. Of those who were told they were obese, 90 percent were also told by their doctors to lose weight, the survey found. In fact most have tried to lose weight and may have been successful in the past— and many are still trying, the survey found. And many understand that losing even a small amount of weight can have a positive impact on their health and reduce their risk of obesityrelated diseases like hypertension and diabetes. Dr. William Bestermann Jr., medical director of Holston Medical Group, in Kingsport, Tenn. , which ranks the 10th in obesity among metropolitan areas in the United States, said the dialogue had to be an ongoing one and could not be dropped after just one mention of the problem. “ If you’ re to be successful with helping your patients lose weight, you have to talk to them at actually every visit about their progress, and find something to encourage them and coach them,” he said. He acknowledged that many doctors tend to be not optimistic. “ Part of this is that there39。 BEIJINGWorldrenowned Oxford and Cambridge have e to China 16 (attract) toprank postgraduate students in cooperation with the China Scholarship Council. Oxford made its first 17 (appear) at the China Scholarship Council39。廣東省六校高三第二次聯(lián) 英語 考試題 及答案 Ⅰ . 語言知識及應(yīng)用 (共兩節(jié)，滿分 45 分 ) 第一節(jié) 完形填空 (共 15 小題；每小題 2 分，滿分 30 分 ) 閱讀下面短文，掌握其大意，然后從 1— 15 各題所給的 A、 B、 C 和 D 項中，選出最佳選項，并在答題卡上將該項涂黑。 One cold night, I was growing sick of my life in San Francisco． There I was walking home around one o’ clock in the morning after a 1 practice at the theatre. With the opening night only a week away, I was still learning my lines by heart. I was having 2 handling my parttime job at the bank in the daytime and my acting at night at the same time. As I walked, I thought seriously about 3 both acting and San Francisco. I had 4 too much of city life. As I walked down the 5 streets under the tall buildings, I felt very small and cold, so I began 6 both to keep warm and to keep away from any possible robbers. Very few people were still out except a few homeless people under blankets. About a block from my 7 , I heard a sound behind me. I 8 quickly, half expecting to see someone with a knife or a gun. The street was empty. All I saw was a shining streetlight. Still, the noise had made me 9 ， so I started to run faster. Not until I reached my apartment building and unlocked the door did I 10 what the noise had been. It had been my wallet 11 to