I catch cold now and then .

The curious looks from the strangers around her made her feel uneasy .

We cannot exist without air, food or water.

Ants as a Barometer of Ecological Change At picnics, ants are pests. But they have their uses. In industries such as mining,farming and forestry, they can help gauge the health of the environment by just crawling around and being antsy. It has been recognized for decades that ant—which are highly sensitive to ecological change—can provide a near-perfect barometer of the state of an ecosystem. Only certain species, for instance, will continue to thrive at a forest site that has been cleared of trees. 【B1】______ And still others will move in and take up residence. By looking at which species populate a deforested area, scientists can determine how "stressed" the land is. 【B2】______Ants are used simply because they are so common and comprise so many species. Where mine sites are being restored, for example, some ant species will recolonize the stripped land more quickly than others. 【B3】______Australian mining company Capricorn Coal Management has been successfully using ant surveys for years to determine the rate of recovery of land that it is replanting near its German Creek mine in Queensland. Ant surveys also have been used with mine-site recovery projects in Africa and Brazil, where warm climates encourage dense and diverse ant populations. "We found it worked extremely well there, " says Jonathan Majer, a professor of environmental biology. Yet the surveys are perfeetlv suited to climates throughout Asia, he says, because ants are so common throughout the region. As Majer puts it; "That's the great thing about ants. " Ant surveys are so highly-regarded as ecological indicators that governments worldwide accept their results when assessing the environmental impact of mining and tree harvesting. 【B4】______ Why not? Because many companies can't afford the expense or the laboratory time needed to sift results for a comprehensive survey. The cost stems, also, from the scarcity of ant specialists. 【B5】______A This allowed scientists to gauge the pace and progress of the ecological recovery.B Yet in other businesses, such as farming and property development, ant surveys aren't used widely.C Employing those people are expensive.D They do this by sorting the ants, counting their numbers and comparing the results with those of earlier surveys.E The evolution of ant species may have a strong impact on our ecosystem.F Others will die out for lack of food.

Most people find rejection hard to accept.

Young Adults Who Exercise Get Higher IQ Scores Young adults who are fit have a higher IQ and are more likely to go on to university, reveals a major new study carried out at the Sahlgrenska Academy and Sahlgrenska University Hospital. The results were recently published in the Proceedings of the National Academy of Sciences(PNAS)The study involved 1. 2 million Swedish men doing military service who were born between 1950 and 1976. The research group analyzed the results of both physical and IQ tests the youngsters took right after they started serving the army. The study shows a clear link between good physical fitness and better results for the IQ test. The strongest links are for logical thinking and verbal comprehension. But it is only fitness that plays a role in the results for the IQ test,and not strength. "Being fit means that you also have good heart and lung capacity and that your brain gets plenty of oxygen," says Michael Nilsson, professor at the Sahlgrenska Academy and chief physician at the Sahlgrenska University Hospital. " This may be one of the reasons why we can see a clear link with fitness, but not with muscular strength . We are also seeing that there are growth factors that are important. " By analyzing data for twins, the researchers have been able to determine that it is primarily environmental factors and not genes that explain the link between fitness and higher IQ. "We have also shown that those youngsters who improve their physical fitness between the ages of 15 and 18 increase their cognitive performance," says Maria Aberg, researcher at the Sahl-grenska Academy and physician at Aby health centre. "This being the case, physical education is a subject that has an important place in schools, and is an absolute must if we want to do well in maths and other theoretical subjects. " The researchers have also compared the results from fitness tests during national service with the socio-economic status of the men later in life. Those who were fit at 18 were more likely to go into higher education, and many secured more qualified jobs.

The Drink Your Body Needs Most1 Our bodies are estimated to be about 60% to 70% water. Blood is mostly water, and our muscles , lungs and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients(滋养物)to travel to all our organs. Water also transports oxygen to our cells,removes waste, and protects our joints and organs.2 We lose water through urination(排尿), respiration(呼吸),and by sweating. If you are very active, you lose more water than if you do not take much exercise. Symptoms of mild dehydration(脱水)include chronic pains in joints and muscles, lower back pain, headaches, and constipation(便秘). A strong smell to your urine, along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact, you need water long before you feel thirsty.3 A good rule of thumb(好的做法)is to take your body weight in pounds and divide that number in half. That gives you the number of ounces(盎司)of water per day that you need. For example, if you weigh 160 pounds, you should drink at least 80 ounces of water per day. If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol, you should add at least an equal amount of water. When you are traveling on an airplane,it is good to have 8 ounces of water for every hour you are on board the plane.4 It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working, traveling, or exercising. If you get bored with plain water, add a bit of lemon for a touch of flavor. There are some brands of flavored water available, but some of them have sugar or artificial sweeteners that you don't need.A Ounces of water needed per dayB Importance of waterC Composition of waterD Signs of dehydrationE Supply of waterF Necessity for bringing a bottle for water

阅读理解Adaptation of Living Things Certain animals and plants develop characteristics that help them cope with their environment better than others of their kind. This natural biological process is called adaptation. Among the superior characteristics developed through adaptation are those that may help in getting food or shelter, in providing protection, and in producing and protecting the young. That results in the evolution of more and more organisms that are better fitted to their environments. Each living thing is adapted to its way of life in a general way, but each is adapted especially to its own distinct class. A plant, for example, depends upon its roots to fix itself firmly and to absorb water and inorganic chemicals. It depends upon its green leaves for using the sun''s energy to make food from inorganic chemicals. These are general adaptations, common to most plants. In addition, there are special adaptations that only certain kinds of plants have. Many animals have adaptations that help them escape from their enemies. Some insects are hidden by their body color or shape, and many look like a leaf or a little branch. The coats of deer are colored to mix with the surroundings. Many animals have the ability to remain completely still when an enemy is near. Organisms have a great variety of ways of adapting. They may adapt in their structure, function, and genetics; in their development and production of the young; and in other respects. An organism may create its won environment, as do warm-blooded mammals, which have the ability to adjust body heat exactly to maintain their ideal temperature despite changing weather. Usually adaptations are an advantage, but sometimes an organism is so well adapted to a particular environment that, if conditions change, it finds it difficult or impossible to readapt to the new conditions.

阅读理解On Antibodies Substances foreign to the body, such as disease-causing bacteria and viruses and other infectious agents, are recognized by the body s immune system as invaders. Our natural defenses against these infectious agents are antibodies, proteins that seek out the antigens (抗原) and help destroy them. Antibodies have two very useful characteristics. First, they are extremely specific; that is, each antibody binds to and attacks one particular antigen. Second, some antibodies, once activated by the occurrence of a disease, continue to confer resistance against that disease. Classic example are the antibodies to the childhood diseases of chickenpox(水痘) and measles. The second characteristic of antibodies makes it possible to develop vaccines. A vaccine (痘苗) is a preparation of killed or weakened bacteria or viruses that, when introduced into the body, stimulates the production of antibodies against the antigens it contains. It is the first trait of antibodies, their specificity, that makes monoclonal antibody technology so valuable. Not only can antibodies be used therapeutically(在治疗上), to protect against disease; they can also help to .diagnose a wide variety of illnesses, and can detect the presence of drugs, viral and bacterial products, and other unusual or abnormal substances in the blood. Given such a diversity of uses for these diseased-fighting substances, their production in pure quantities has long been the focus of scientific investigation. The conventional method was to inject a laboratory animal with an antigen and then, after antibodies had been formed, collect those antibodies from the blood serum(血清) (Antibody containing blood serum is called antiserum (抗血清)). There are two problems with this method: It yields antiserum that contains undesired substances, and it provides a very small amount of usable antibody. Monoclonal antibody technology allows us to produce large amounts of pure antibodies. in the following way: we can obtain cells that produce antibodies naturally; we also have available a class of cells that can grow continually in cell culture (培养). If we form a hybrid (混血儿) that combines the characteristic of "immortality"(永生)with the ability to produce the desired substance, we would have, in effect, a factory to produce antibodies that work around the clock. In monoclonal antibody technology, tumor cells that can replicate (重复) endlessly are fused with mammalian cells that produce an antibody. The result of this cell fusion is a "hybridoma" (杂交瘤), which will continually produce antibodies. These antibodies are called monoclonal because they come from only one type of cell, the hybridoma cell; antibodies produced by conventional methods, on the other hand, are derived from preparations containing many kinds of cells, and hence are called polyclonal. An example of how monoclonal antibodies are derived is described below. A myeloma is a tumor of the bone marrow (骨髓) that can be adapted to grow permanendy in cell culture. When myeloma cells were fused with antibody-producing mammalian spleen cells, it was found that the resulting hybrid cells, or hybridomas, produced large amounts of monoclonal(骨髓瘤) antibody. This product of cell fusion combined the desired qualities of the two different types of cells: the ability to grow continually, and the ability to produce large amounts of pure antibody. Because selected hybrid cells produce only one specific antibody, they are more pure than the polyclonal antibodies produced by conventional techniques. They are potentially more effective than conventional drugs in fighting disease, since drugs attack not only the foreign substance but the body’s own cells as well, sometimes producing undesirable side effects such as nausea(恶心) and allergic reactions. Monoclonal antibodies attack the target molecule and only the target molecule, with no or greatly diminished side effects.

阅读理解Cigars Instead? Smoking one or two cigars a day doubles the risk of cancers of the lip, tongue, mouth, and throat, according to a government study. Daily cigars also increase the risk of lung cancer and cancer of the esophagus, and increase the risk of cancer of the larynx (voicebox) sixfold, say researchers at the National Cancer Institute in Bethesda, Maryland. In addition, the report revealed that smoking three or four cigars a day increased the risk of oral cancer to 8.5 times the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers. The health effects of smoking cigars is one of eight sections of the article " Cigars: Health Effects and Trends". The researchers report that, compared with a cigarette, a large cigar emits up to 90 times as much carcinogenic tobacco-specific nitrosamines "This article provides clear and invaluable information about the disturbing increase in cigar use and the significant public health consequences for the country," said Dr. Richard Klausner, director of the National Cancer Institute, in a statement. "The data are clear-the harmful substances and carcinogens in cigar smoke, like cigarettes, are associated with the increased risks of several kinds of cancers as well as heart and lung diseases," he added. " In other words, cigars are not safe alternatives to cigarettes and may be addictive. " "To those individuals who may be thinking about smoking cigars, our advices is — don''t. To those currently smoking cigars, quitting is the only way to eliminate completely the cancer, heart and lung disease risks," warned Klausner. According to a National Cancer Institute press release, there haven''t been any studies on the health effects on nonsmokers at cigar social events, but "... a significant body of evidence clearly demonstrates an increased lung cancer risk from secondhand smoke. "

阅读理解Most Adults in U. S. Have Low Risk of Heart Disease More than 80 percent of US adults have a less than 10 percent risk of developing heart disease in the next 10 years, according to a report in the Journal of the American College of Cardiology. Just 3 percent have a risk that exceeds 20 percent. "I hope that these numbers will give physicians, researchers, health policy analysts, and others a better idea of how coronary heart disease is distributed in the US population, " lead author Dr. Earl S. Ford, from the Centers for Disease Control and Prevention in Atlanta, said in a statement. The findings are based on analysis of data from 13,769 subjects, between 20 and 79 years of age, who participated in the Third National Health and Nutrition Examination Survey from 1988 to 1994. Overall, 82 percent of adults had a risk of less than 10 percent, 15 percent had a risk that fell between 10 to 20 percent, and 3 percent had a risk above 20 percent. The proportion of subjects in the highest risk group increased with advancing age, and men were more likely than women to be in this group. By contrast, race or ethnicity had little effect on risk distributions. Although the report suggests that most adults have a low 10-year risk of heart disease, a large proportion have a high or immediate risk, Dr. Daniel S. Berman, from Cedars-Sinai Medical Center in Los Angeles, and Dr. Nathan D. Wong, from the University of California at Irvine, note in a related editorial. Aggressive treatment measures and public health strategies are needed to shift the overall population risk downward, they add.

阅读理解Architecture Architecture is to building as literature is to the printed word. ''The best buildings ate often so well constructed that they outlast their original use. They then survive not only as beautiful objects, but as documents of the history of cultures. These achievements are never wholly the work of individuals. Architecture is a social art. The renaissance brought about an entirely new age, not only in philosophy and literature but in the visual arts as well. In architecture, the principles and styles of ancient Greece and Rome were brought back to life and reinterpreted. They remain dominant until the 20th century. Many kinds of stone are used as building materials. Stone and marble were chosen for important monuments because they are not burnable and Can be expected to endure. Stone architecture was often blended with stone sculpture. The use of stone has declined, however, because a number of other materials ate more adaptable to industrial use. The complexity of modem lire calls for a variety of buildings. More people live in mass housing and go to work in large office buildings; they spend their income in large shopping centers, send their children to many different kinds of schools, and when they ate sick they go to specialized hospitals and clinics. All these different types of buildings accumulated experiences needed by their designers. By the middle of the 20th century, modem architecture, which was influenced by new technology and mass production, was dealing with increasingly complex social needs. Important characteristics of modem architectural works are expanses of glass and the use of reinforced concrete. Advances in elevator technology, air conditioning, and electric lighting have all had important effects. A. Building Materials B. Need of Greater Building Varieties in Modern Life C. Restoration of Ancient Civilizations D. Evolution in Style E. Factors Affecting Modem Architectur 6 F. A Social Art

阅读理解Global Warming and Technological changes Recent studies have identified four major global environmental risks: acid rain, ozone depletion, deforestation and the greenhouse effect. On the whole, thanks to technological changes, people now tend to move toward warmer regions in North America and Europe. Climate warming will probably be a boon to Alaska, which is America''s least productive state in Gross National Product(GNP)per square mile. Studies of the impact of global warming on the United States and other developed regions find that the most vulnerable areas are those dependent on unmanaged ecosystems—on naturally occurring rainfall, run-off and temperatures, and the extremes of these variables. Agriculture, forestry and coastal activities fall into this category. Most economic activity in industrialized countries, however, depends very little on the climate. Intensive-care units of hospitals, communications, heavy manufacturing and microelectronics are among the sectors likely to be unaffected by climatic change. In selecting whether to set up in, say, Hong Kong or in Warsaw, few businesses will consider temperature a weighty factor. Greenhouse warming would have little effect on Americas national output. About 3% of American GNP originates in climate sensitive sectors such as farming and forestry. Another 10% comes from sectors only modestly sensitive-energy, water systems, property and construction. For the largest share, 87% , comes from sectors, including most services, that are negligibly affected by climate change.

阅读理解Resistance to Malaria 1. "Our job", said the health officer, "is to spray the walls of every house in every town and village in the malaria parts of Mexico". You may be surprised to learn that there are about ninety-nine thousand separate villages and towns. Some are big places like Mexico City, some are single houses deep in the jungles or upon the mountain-tops. The men working with our programme say that most of these localities lie within districts warm enough for the malaria-carrying mosquitoes to live in and spread the disease. That means that we must plan to spray the walls of nearly three million house once or twice a year for five years." 2. "We have studied everything very carefully" , the officer continued. "Our advance guards have drawn maps of some forty thousand parts of the country for use by the spray teams. Each house in the malaria districts has been given a special number. The United Nations has given us cars and trucks to carry the spray teams and their tools, but many of the houses to be sprayed are too difficult to reach by car. Half of our spray teams go on horseback or by boat." 3. "The malaria programme has been popular with the Mexican people. Everyone wants to help. The navy has offered us the services of ships. The Defence Department is helping us plan the movement of men and supplies. The Ministry of Education has printed sheets in Spanish and the more widely spoken Indian languages to explain how malaria is spread and why spraying helps. Doctors have spoken in the churches of many communities to explain the programme." 4. Resistance is a problem. It was in the United States that such resistance to sprays was first proved. Since then many other insects have developed resistance to poisons. Take the case of the housefly and D.D.T. At first D.D.T. killed them off. For a time flies died quickly. Then no more. Now D.D.T. wont hurt a fly. 5. What worries the health workers is the danger that mosquitoes may become resistant. Already resistance to some of the sprays has appeared in parts of the world, although no insect is yet resistant to all of the sprays. A. What worries us? B. What we have done? C. What''s our job? D. More and more people joined us. E. It will be a hard work. F. What''s the problem?

阅读理解Biotechnology Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they could plant their own crops and breed their own animals, they learned to use biotechnology. The discovery that fruit juices fermented(发酵) in wine, or that milk could be converted into cheese or yogurt(酸乳酶) or that beer could be made by fermenting solutions of malt(麦芽) and hops(啤酒花) began the study of biotechnology. When the first bakers found that they could make a soft, spongy(多乳的) bread rather than a firm, thin cracker they we''re acting as fledgling(缺乏经验的) biotechnologists. The first animal breeders, realizing that different physical traits could be either magnified or lost by mating appropriate pairs of animals, engaged in the manipulations of biotechnology. What then is biotechnology? The term brings to mind different things. Some think of developing new types of animals. Others dream of almost unlimited sources of human therapeutic (治疗的) drugs. Still others envision (想象) the possibility of growing crops that are more nutritious(有养分的) and naturally pest-resistant (有抵抗力的) to feed a rapidly growing world population. This question elicits (引发) almost as many first-thought responses as there are people to whom the question can be posed. In its purest form, the term "biotechnology" refers to the use of living organisms or their products to modify human health and the human environment. Prehistoric biotechnologists did this as they used yeast cells to raise bread dough(生面团) and to ferment alcoholic beverages, and bacterial cells to make cheeses and yogurts and as they bred their strong, productive animals to make even stronger and more productive offspring. Throughout human history, we have learned a great deal about the different organisms that our ancestors used so effectively. The marked increase in our understanding of these organisms and their cell products gains us the ability to control the many functions of various cells and organisms. Using the techniques of gene splicing(叠接) and recombine DNA technology, we can now actually combine the genetic elements of two or more living cells. Functioning lengths of DNA can be taken from one organism and placed into the cells of another organism. As a result, for example, we can cause bacterial cells to produce human molecules cows can produce more milk or the same amount of feed, and we can synthesize the rapeutic molecules that have never before existed.

阅读理解How to Be a Nurse The physicians in a hospital form the core of the medical staff. But they could not provide effective medical care to their patients without the help of numerous other medical employees. From the view point of the patients, the nursing staff is particularly important. Nurses are usually in close contact with patients as long as they are in the hospital. A nurse does not study for as many years as a doctor. However each must be equally dedicated. Caring for sick persons requires a great deal of patience and concern. Most nurses work long days, and they often must work at odd hours or during the night. Under the supervision of the head nurse, the nursing staff must provide nursing services on a 24-hour basis and attend to patients’ needs. This responsibility continues around the clock, and so nurses must work in shifts. A shift is a period of duty usually eight in length. The nurses on the ward rotate their shifts. Some take turns working night duty; others work odd shifts. All of them work out of a central area on the ward called the nurses’ station. A nurse must always be alert. She can never afford to be careless. This is true in all nursing situation, but it is especially true in the intensive care unit. Patients under intensive care are critically ill, and they must be monitored at all times. The nurses who do intensive care duty have one of the most demanding jobs in the hospital. Serving as a nurse can be a very rewarding job. But it is not an easy one. Not every person is suited to become a nurse. Only very dedicated people have chosen nursing as a profession.

阅读理解On the Train The night train from Glasgow was so crowded that Donald, who was on his way to London to find a temporary job for the university vacation, wished that he had decided to travel by day. He had never been so hard up. He got on the train and walked along the corridor of the second-class compartments. He couldn''t find a seat anywhere. He could not afford to travel first class, and he did not want to stand in the corridor. Neither did he want to sit on his suitcase. He was so tired that he decided to sit down in a first class compartment at least for a while. He soon found one with a single occupant (乘客) , a gentleman reading documents from a briefcase. With the self-assurance of a first class traveler, he opened the door and went in. No sooner had he sat down than the ticket inspector arrived. What bad luck! Now he would have to pay the excess (额外的) fare. As he turned out his pocket to find enough money he saw the gentleman was watching him with amusement. It was humiliating (令人感到羞辱的). However, he was so tired that he soon fell asleep. Presently, hearing a noise, he half opened his eyes. Not only did he notice that his traveling companion had gone, but he also saw that a rough-looking man was searching through the businessman''s briefcase. Donald grabbed the briefcase and wrenched (猛夺) it free, kicking at the man''s leg. The man fled. Then the businessman returned and found Donald holding the briefcase and peering inside it. Donald realized that he was in quite an awkward situation, but the man was smiling. Nor was this the only surprising thing. Not only was the gentleman (who introduced himself as Mr. Smith) smiling, but he thanked Donald warmly. On his way back to the compartment, Mr. Smith had seen the man leaving in a great hurry. He had so quickly assessed the situation that he knew Donald was innocent. Only after a long chat, in which Donald was asked many questions about himself, did Donald discover that Mr. Smith was in fact managing director of a large factory in London. Donald had never imagined that this strange incident would help him to find a job, but just as they were leaving the train, Mr. Smith offered him the post of temporary Night Security Officer for his factory.

阅读理解Natural Health Care Natural health care is a philosophy and a set of principles and practices based on science that lead to an extraordinary level of personal health and happiness. It recognizes the unity of all life and holds that physical, mental, and emotional health cannot be separated, and that personal health, environmental health, and community health are parts of a whole. Natural hygiene (卫生学) teaches that the best way to achieve best health is right living—developing self-esteem and a positive attitude towards life; eating fresh, whole natural foods; exercising regularly; getting plenty of rest and sleep; getting plenty of fresh air and sunshine; learning to handle stress; and avoiding all negative influences of life. Basic principles: Natural health care is unique in its argument that health is normal—as simple as living in harmony with nature. Health and disease are a continuum (连续统一体)—the same physiological (生理的) laws govern the body in sickness and in health. Healing (康复) is a biological process—except in extraordinary circumstances, healing is the result of actions undertaken by the body on its own behalf. The tradition of natural health care: The traditional principles of natural hygiene are explained by Herbert M. Shelton in his Natural Hygiene: The Plain Way of Life. Shelton writes: It should not require argument to convince intelligent men and women that man can return to health and strength only upon a basis of law, natural law, specifically, upon a basis of those laws that operate to make human life possible. All laws essential to the welfare of man are written in his own constitution. Every rule of human conduct to be valued in promoting human welfare and happiness must be in harmony with his nature. No law, no social custom, no moral principle, can have any validity (有效性) for man that does not agree with his highest welfare. If it is not closely related to man''s highest physical, moral and intellectual fitness, it cannot be consistent with his highest ideals of truth, duty and enjoyment.

阅读理解Vegetarianism A strict vegetarian is a person who never in his life eats anything derived from animals. The main objection to vegetarianism on a long-term basis is the difficulty to getting enough protein, the body building elements in food. If you have ever been without meat or animal foods for some days of weeks(say, religious reasons) you will have noticed that you tend to get physically rather weak. You are glad when the fast is over and you get your reward of a succulent meat meal. Proteins are built up from approximately twenty food elements called "amino-acids", which are found more abundantly in animal protein than in vegetable protein. This means you have to eat a great deal more vegetable than animal food in order to get enough of these amino-acids. A great of the vegetable food goes to waste in this process and from the physiological point of view there is not much to be said in favor of life-long vegetarianism. The economic side of the question, though, must be considered. Vegetable food is much cheaper than animal food. However, since only a small proportion of the vegetable protein is useful for body-building purposes, a consistent vegetarian, if he is to gain the necessary 70 grams of protein a day, has to consume a greater bulk of food than his digestive organs can comfortably deal with. In fairness, though, it must be pointed out that vegetarians claim they need far less than 70 grams of protein a day. Whether or not vegetarianism should be advocated for adults, it is definitely unsatisfactory for growing children, who need more protein than they can get from vegetable source''s. A lacto-vegetarian diet, which includes milk and milk products such as cheese, can, however, be satisfactory as long as enough milk and milk products are consumed. Meat and cheese are the best sources of usable digestible and next come milk, fish and eggs. Slow and careful cooking of meat makes it more digestible and assists in the breaking down of the protein content by the body. When cooking vegetables, however, the vitamins, and in particular the water-solube vitamin C, should be lost through overcooking.

阅读理解Anatomy 1. The term anatomy comes from Greek anatomy, "dissection". It is a branch of natural science dealing with the structural organization of living things. The proper understanding of structure, however, implies a knowledge of function in the living organism. Anatomy is therefore almost inseparable from physiology, which is sometimes called functional anatomy. 2. It is convenient to subdivide the study of anatomy in several different ways. One classification is based on the type of organisms studied, the major subdivisions being plant anatomy and animal anatomy. Animal anatomy is further subdivided into human anatomy and comparative anatomy, which seeks out similarities and differences among animal types. Anatomy can also be subdivided into biological processes, for example, developmental anatomy, the study of embryos, and pathological anatomy, the study of diseased organs. 3. The oldest known systematic study of anatomy is contained in an Egyptian papyrus dating from about 1600 BC. In the 4th century BC Aristode increased anatomical knowledge of animals. The first real progress in the science of human anatomy was made in the following century by the Greek physicians Herophilus and Erasistratus, who dissected human cadavers (尸体) and were the first to distinguish many functions , including those of the nervous and muscular systems. 4. Modern anatomy began with the publication in 1543 of the work of the Belgian anatomist Andreas Vesalius. Before the publication of this classical work anatomists had been so bound by tradition that the writings of authorities of more than 1000 years earlier, were accepted in lieu of actual observation. Vesalius and other Renaissance anatomists, however, based their descriptions on their own observations of human corpses, thus setting the pattern for subsequent study in anatomy. 5. The 17th-century invention of the compound microscope led to the development of microscopic anatomy. Under the leadership of the Italian anatomist Marcello Malpighi, the study of the microscopic structure of animals and plants flourished during the 17th century. Microscopic anatomy developed rapidly in the 19th century. Knowledge of microscopic anatomy was greatly expanded during the 20th century as a result of the development of microscopes. A. The Beginning of research B. The subdivision of Anatomy C. The Beginning of Mordern Anatomy D. Anatomy in Ancient Times E. A Brief History of Microscopich Anatomy F. The definition of Anatomy