填空题The Drink Your Body Needs Most 1 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 all 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 Day B. Importance of Water C. Composition of Water D. Signs of Dehydration E. Supply of Water F. Necessity for Bringing a Bottle for Water with Yon

填空题 阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。 {{B}} First Aid{{/B}}1 First aid is the kind of medical that are given to a victim of an accident or sudden sickness before trained medical help can arrive. First aid techniques are often simple. They can be taught to people of all ages. And learning them is important. Knowing how to treat someone in an emergency can mean the difference beween life and death.2 Thousands of persons die each year after eating or drinking poison substances. Experts say most accidental poisonings happen in or near the home. And most are caused by substances we commonly use at home: medical supplies, insect poisons or cleaning fluids. There are several common signs of poisoning. A sudden feeling of pain or sickness. Burns in the area of the mouth. Or an unusual smell coming from a person's mouth.3 Health experts generally advise poison victims to drink water or milk. But never give liquids to someone who is not awake or to those having a violent reaction to the poison. Next, seek help from trained medical experts. Save material expelled from the mouth for doctors to examine. Save the container of the suspected poison to answer questions the doctors may have. The container also may describe a substance that halts the poison's effects. Use this substance without delay.4 The American Red Cross says all homes should have at least three substances to deal with poisoning. One, syrup of ipecac(吐根糖浆),is a fluid that helps the body expel material from the stomach. Another, activated charcoal (活性炭), lessens the danger of poisons. The other material, epsom salts(泻盐), helps to speed the release of body wastes. All three should be used only on the advice of a medical expert.5 The Red Cross says expulsion (清除) of material from the stomach—vomiting (呕吐)— sometimes may be started if medical advice is delayed. But it says vomiting should be used only when it is known the victim took too much of what is called a general poison, such as a medicine. The experts say never cause vomiting if the victim was poisoned by a petroleum product or by a substance that was a strong acid or a strong alkali(碱). These victims should be taken to a medical center as soon as possible.

填空题 阅读下面这篇短文，短文后有2项测试任务：(1)1～4题要求从所给的6个选项中为第 2～5段每段选择1个正确的小标题；(2)第5～8题要求从所给的6个选项中选择4个正确的选项，分别完成每个句子。请将答案写在相应的位置上。 {{B}} More Than 8 Hours Sleep Too Much of a Good Thing{{/B}} Although the dangers of too little sleep are widely known, new research suggests that people who sleep too much may also suffer the consequences. Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep, as well as a number of other sleep problems, than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night's sleep than 8-hour sleepers. These findings, which DL Daniel Kripke reported in the journal Psychosomatic Medicine, demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night. He added that "it might be a good idea" for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed, but cautioned that more research is needed to confirm this. Previous studies have shown the potential dangers of chronic shortages of sleep--for instance, one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more. For the current report, Kripke reviewed the responses of 1,004 adults to sleep questionnaires, in which participants indicated how much they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night, arising early in the morning and being unable to fall back to sleep, and having fatigue interfere with day-to-day functioning. Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence, he added that one way to help insomnia is to spend less time in bed. "It stands to reason that if a person spends too long a time in bed, then they'll spend a higher percentage of time awake. "he said.

填空题Aspirin — a New Miracle Drug 1. Using aspirin, an over-the-counter pill on sale in every supermarket without a prescription, to treat serious circulatory disease may seem almost like quackery. But today doctors recognize this drug as a potent compound as important as antibiotics, digitalis and other miracle drugs. 2. In its natural form as willow bark and leaves, this remarkable remedy dates back to Hippocrates. In 1829 the chemical in the willow tree that can relieve pain and reduce fever was discovered to be salicin. By 1899 the Bayer Company in Germany had marketed a variant, acetylsalicylic acid, under the name of aspirin. 3. Since then, aspirin and compounds containing aspirin have been taken by tens of millions of arthritis patients. As a pain killer aspirin is, according to one study, more effective than all other analgesics and narcotics available for oral use. It also acts on the body's thermostat, turning down fever. 4. But some of its powers remained unsuspected until recently. In 1950 the late Dr. Craven wrote to a small western medical journal about 400 overweight, sedentary male patients to whom he had given one or two aspirin tablets a day. None had had a heart attack. He enlarged his group to 8,000 and in 1956 reported: "Not a single case of detectable coronary or cerebral thrombosis" and "no major stroke" had occurred in patients who had taken one or two tablets daily for from one to ten years. But his observations were largely ignored. 5. Then Dr. Vane proved that aspirin turned off the body's prostaglandins hormonelike chemicals that can be secreted by every cell. Some potent prostaglandins are harmful compounds that create fever, pain and arthritis. One of them stimulates platelets in the blood to begin forming clots inside arteries. Aspirin blocks this dangerous effect. 6. Vane's finding caused some researchers to recall Craven's 1956 observations, which now had a possible scientific explanation. Numerous studies were begun to find out whether aspirin could indeed inhibit heart attacks and stroke. 7. In 1972, ten US medical institutions began two "double-blind" trials of 303 patients who suffered from transient ischemic attacks (TIAs). Four aspirin tablets a day were given to 153 patients, while placebo tablets were given to 150. Neither patients nor doctors knew which was which. After six months, the patients on aspirin had experienced much fewer TIAs, and fewer strokes and deaths from strokes than the "controls". The results were so conclusive that aspirin has been used for this purpose widely.

填空题A Biological Clock Every living thing has what scientists call a biological clock that controls behavior. 1 It tells insects when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal affect the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur because of the number of hours of daylight. In the short days of winter, its fur becomes white. 2 3 German scientists found that some kind of internal clock seems to order birds to begin their long migration flight twice each year. Birds prevented from flying become restless when it is time for the trip, but they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which parts of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain seems to control the timing of some of our actions. 4 Scientists say there probably are other biological clock cells that control other body activities. Dr. Moorhead is studying how our biological clocks affect the way we do our work. For example, most of us have great difficulty if we must often change to different work hours. 5 Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said such understanding could cut sickness and accidents at work and would help increase a factory"s, production. A. These cells tell a person when to awaken, when to sleep and when to seek food. B. Inner signals control other biological clocks. C. The biological clock tells plants when to form flowers and when the flowers should open. D. It can take many days for a human body to accept the major change in work hours. E. The reason why there is a biological clock is not confirmed. F. The fur becomes gray brown in color in the longer hours of daylight in summer.

填空题To most, common sense means the ability to present sound, practical judgments on everyday affairs. To do this, one has to sweep aside extra ideas and get right to the core of what matters. ______ In conduction of meeting and dealing with industry reducing a complex problem to the simplest term is highly important. "A. And 61 percent say that common sense was very important in contributing to their success.B. Besides common sense, there are many other factors that influence success: knowing your field, self - reliance, intelligence, the ability to get things done, leadership, creativity, relationships with others, and of course, luck.C. At the Gallop Organization we recently focused in depth on success, probing the aaitudes of 1500 prominent people selected at random from who's who in America.D. A Texas oil and gas businessman puts it this way: "The key ability for success is simplifying.E. If you develop these qualities, you'll succeed.F. Another way to increase your store of common sense is to observe it in others, learning from their--and your own--mistakes.

填空题 下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第3～6段每段选择1个最佳标题：(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。 Drug Abuse 1 The term "drug abuse" most often refers to the use of a drug with such frequency that it causes physical or mental harm to the user or impairs social functioning. Although the term seems to imply that users abuse the drugs they take, in fact, it is themselves or others they abuse by using drugs. 2 Pharmacologists, who study the effects of drugs, classify psychoactive drugs according to what they do to those who take them. Drugs that speed up signals passing through the nervous system, which is made up of the brain and spinal cord, and produce alertness and arousal in higher doses , excitability, and inhibit fatigue and sleep, are called stimulants. Drugs that retard, slow down, or depress signals passing through the central nervous system and produce relaxation, a lowering of anxiety, and, at higher doses, drowsiness and sleep, are called depressants. One distinct kind of depressants are those which dull the mind's perception of pain and in medicine are used as painkillers, or analgesics. These drugs called narcotics. 3 It is not always easy to determine exactly when simple drug use becomes abuse. Thus it is far easier to study who uses illegal psychoactive drugs than it is to study who abuses them. When researchers describe patterns of drug abuse, then, they usually describe the more general phenomenon of drug use, whether it leads to abuse or not. 4 Drinking on the job is a social and economic problem with a long history. With the growing popularity of illegal drugs in the 1960s and 1970s, it was to be expected that their use in the workplace would emerge as a major issue by the 1980s. Estimates of employee drug use vary greatly, ranging from 10 percent to 25 percent for the proportion of workers who use drugs occasionally on the job. 5 From the 1920s until the 1960s, treatment of drug abuse in the United States was practically nonexistent. During this period many officials did not believe that treatment was effective or necessary. Drug abusers and sellers were simply arrested and imprisoned, thereby discouraging use. The dramatic explosion in the use and abuse of a wide range of different drugs during the 1960s demonstrated the weakness of this theory. As a result, two treatment programs were developed during the 1960s. A. Patterns of drug abuse B. Treatment C. Drug testing in the workplace D. Classification of psychoactive drugs E. Definition

填空题A. if there isn't enough dopamine in your bodyB. what affects muscles all through your bodyC. which cannot be cured yetD. if you have a fixed or blank expressionE. which may be the first symptom you noticeF. what causes Parkinson's disease

填空题A. be costlyB. harmfulC. save a lifeD. still open to debateE. reduce the risk of radiation triggering a cancerF. reduced to the minimum

填空题Chest Compressions: Most Important of CPR Cardiopulmonary resuscitation, or CPR, can save the life of someone whose heart has stopped. The condition is called cardiac arrest. The heart stops pumping blood. The person stops breathing. Without lifesaving measures, the brain starts to die within four to six minutes. CPR combines breathing into the victim's mouth and repeated presses on the chest. (1) However, a new Japanese study questions the usefulness of mouth-to-mouth breathing. The study was published in the British medical magazine, The Lancet3 Doctors in Tokyo led the research. It examined more than four thousand people who had suffered cardiac arrest. In all the cases, witnesses saw the event happen. More than one thousand of the victims received some kind of medical assistance from witnesses. Seven hundred and twelve received CPR. Four hundred and thirty-nine received chest presses only. (2) The researchers say any kind of CPR improved chances of the patient's survival. But, they said those people treated with only chest presses suffered less brain damage. Twenty-two percent survived with good brain ability. (3) The American Heart Association changed its guidelines for CPR chest presses in 2005. (4) Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson. He wrote a report that appeared with the study. Doctor Ewy thinks the CPR guidelines should be changed again. He said the heart association should remove rescue breaths from the guidelines. He argues that more witnesses to cardiac arrests would provide treatment if rescue breaths are not a part of CPR. He says this would save lives. (5) Cardiac arrest kills more than 300, 000 people in the United States every year. The American Heart Association says about ninety-five percent of victims die before they get to a medical center. A. So far, we have not known exactly yet whether mouth-to-mouth breathing is really useless in CPR. B. Only ten percent of the victims treated with traditional CPR survived with good brain ability. C. CPR keeps blood and oxygen flowing to the heart and brain. D. His studies show that many people do not want to perform mouth-to-mouth breathing on a stranger for fear of getting a disease. E. It said people should increase the number of chest presses from fifteen to thirty for every two breaths given. F. No mouth-to-mouth rescue breaths were given to them.

填空题False Fear of Big Fish Many people believe sharks (鲨鱼)are dangerous and will always try to hurt or even kill humans. (46) A shark exhibition at the National Aquarium (水族馆) in Baltimore, US, proves this. Visitors can touch young sharks, see their eggs develop and watch a dozen different species swim smoothly around a huge tank. Most people fail to realize that shark attacks don't happen very often. Humans are more likely to be killed by lightning than by a shark. (47) There, kids can learn, from an early age, not to fear sharks. "People fear what they don't know," said Nancy Hotchkiss, an organizer of the exhibition. "Sharks have been around for 400 million years and play an important role in the ocean's food chain. We want people to discover that sharks are amazing animals that need our respect and protection." (48) A study, published in January in the US magazine, Science, found that almost all recorded shark species have fallen by half in the past 8 to 15 years. Thousands of sharks are hunted in Asia for special foods, such as shark fin (鱼翅) soup. And many others get caught in nets, while fishermen are hunting other fish. (49) "Some fishing methods are actually cleaning out the ocean for sharks," said Dave Schofield, the manager of the aquarium's ocean health programme. (50) A. They can watch them develop inside their eggs and feel the skin of the older swimmers. B. A shocking 100 million sharks are killed every year around the world by humans. C. In fact, 94 percent of the world's 400 species are harmless to humans. D. It is a worrying situation and some areas have put measures in place to protect these special fish. E. And to make this point clear, the museum has set up a special touching pool for children. F. More than half of the sharks caught are smaller than 1 metre long.

填空题A Biological Clock Every living thing has what scientists call a biological clock that controls behavior. 1 It tells insects when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal affect the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur because of the number of hours of daylight. In the short days of winter, its fur becomes white. 2 3 German scientists found that some kind of internal clock seems to order birds to begin their long migration flight twice each year. Birds prevented from flying become restless when it is time for the trip, but they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which parts of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain seems to control the timing of some of our actions. 4 Scientists say there probably are other biological clock cells that control other body activities. Dr. Moorhead is studying how our biological clocks affect the way we do our work. For example, most of us have great difficulty if we must often change to different work hours. 5 Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said such understanding could cut sickness and accidents at work and would help increase a factory"s production. A. These cells tell a person when to awaken, when to sleep and when to seek food. B. Inner signals control other biological clocks. C. The biological clock tells plants when to form flowers and when the flowers should open. D. It can take many days for a human body to accept the major change in work hours. E. The reason why there is a biological clock is not confirmed. F. The fur becomes gray brown in color in the longer hours of daylight in summer.

填空题The First Four Minutes When do people decide whether or not they want to become friends.'? During their first four minutes together, according to a book by Dr. Leonard Zunin. In his book, "Contact: The first four minutes," he offers this advice to anyone interested in starting new friendships: (46) . A lot of people's whole lives would change if they did just that. You may have noticed that average person does not give his undivided attention to someone he as just met. (47) . If anyone has ever done this to you, you probably did not like him very much. When we are introduced to new people, the author suggests, we should try to appear friendly and self-confident. In general, he says, "People like people who like themselves." On the other hand, we should not make the other person think we are too sure of ourselves. It is important to appear interested and sympathetic, realizing that the other person has his own needs, fears, and hopes. Hearing such advice, one might say, " But I'm not a friendly, self-confident person. That's not my nature. It would be dishonest for me to be at that way. " (48) . We can become accustomed to any changes we choose to make in our personality. "It is like getting used to a new car. It may be unfamiliar at first, but it goes much better than the old one. " But isn't it dishonest to give the appearance of friendly self-confidence when we don't actually feel that way? Perhaps, but according to Dr. Zunin, "total honesty" is not always good for social relationships, especially during the first few minutes of contact. There is a time for everything, and a certain amount of play-acting may be best for the first few minutes of contact with a stranger. That is not the time to complain about one's health or to mention faults one finds in other people. It is not the time to tell the whole truth about one's opinions and impressions. (49) . For a husband and wife or a parent and child, problems often arise during their first four minutes together after they have been apart. Dr. Zunin suggests that these first few minutes together be treated with care. If there are unpleasant matters to be discussed, they should be dealt with later. The author says that interpersonal relations should be taught as a required course in every school, along with reading, writing, and mathematics. (50) that is at least as important as how much we know.A. In reply, Dr. Zunin would claim that a little practice can help us fee/ comfortable about changing our social habits.B. Much of what has been said about strangers also applies to relationships with family members and friends.C. In his opinion, success in life depends mainly on how we get along with other people.D. Every time you meet someone in a social situation, give him your undivided attention for four minutes.E. He keeps looking over the other person's shoulder, as if hoping to find someone more interesting in another part of the room.F. He is eager to make friends with everyon

填空题 阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有的位置，以恢复文章原貌。请将答案填在相应的横线上。 {{B}} Agitated Sunspot Cause Trouble{{/B}} If the lights in your house keep flickering, blame frequent sunspots. A sunspot is actually charged particles flying at the speed of 3 million kilometers an hour out of the surface of the sun to form sun storms. {{U}} (1) {{/U}} The earth, which is directly energized by the sun, is influenced by sun storms in a number of ways. {{U}} (2) {{/U}}Wireless short-wave communication, which depends on the wave's reflection against this layer of atmosphere, is likely to be jammed. It is said that mobile phone communication may be affected too. {{U}} (3) {{/U}}According to a research conducted by the Russian scientists from 1957 to 1960, the frequency of earthquakes can be linked to the movement of the sunspots. Though little research has been carried out about how exactly the sunspot will negatively harm the health of the people, a paper published by a North Korea observatory says that sun storms may cause an increase in the incidence of heart disease and skin disease.{{U}} (4) {{/U}}. Besides, the nervous system is also affected, and traffic accidents are more frequent when sunspots are active. It is hard to say when the sunspots are most violent during their active year, but generally one active period is believed to last possibly eight days. Not long ago there were two violent sun storms breaking out, which seriously affected mobile phone communication, etc. in many parts of the world.{{U}} (5) {{/U}}. A. Ionosphere is high above the earth. B. One is that the magnetic filed of the earth is much disturbed because of the sun's interference in the ionosphere which is 80 to 500 kilometers above the earth. C. Scientists also say that the active movement of the charged sun storm also has effects on earthquakes. D. Every 11 years, the sun, as its energy accumulate inside up to a certain point, will send out streams of charged particles, which affect the earth in different ways. E. But the communication situation in each case returned to normal in about 24 hours. F. So, scientists warn that people going outdoors should be careful to protect their exposed skin and eyes with clothes, umbrellas and sunglasses from the strong sunlight rich in ultraviolet rays.

填空题Old Man Myths and Realities 1. When does a middle-aged man become an old man? Officially, of course, it"s when we reach retirement age. But, as we all know, this is a fairly blunt (生硬的) method of decision making. As life expectancy (预期寿命) increases, retirement planning needs to be changed. This is because being an old man today is very different from what it was a generation or so ago. 2. Sixty-five is the new middle-aged man. These days people are talking about the young-old, that is ages 70 -75, and those over 75 as the old-old. The young-old frequently continue in good health and maintain strong links with friends and family. The old-old have a much higher chance of poor health and social isolation. 3. Although men are living longer, there are still more old women than old men. This fact alone should arouse interest as to why. Relatively little is actually known about why this is the case or about the experiences of the old man. Sure, we are aware that the old man experiences anxiety, financial problems, loneliness, etc., but that"s really about all we know. 4. It is usually believed that the old man often complains about their health. In fact, most rate their health as good even though most are diagnosed with at least one chronic illness. The physical health of the old man is strongly affected by their health behavior when they were younger.

填空题 The Dangers of Secondhand Smoke Most people know that cigarette smoking is harmful to their health. Scientific research shows that it causes many kinds of diseases. In fact, many people who smoke get lung cancer However, Edward Gilson has lung cancer, and he has never smoked cigarettes. He lives with his wife, Evelyn, who has smoked about a pack of cigarettes a day throughout their marriage. {{U}} {{U}} 1 {{/U}} {{/U}} No one knows for sure why Mr. Gilson has lung cancer. Nevertheless, doctors believe that secondhand smoke may cause lung cancer in people who do not smoke because nonsmokers often breathe in the smoke from other people's cigarettes. {{U}} {{U}} 2 {{/U}} {{/U}}The US Environmental Protection Agency reports that about 53,000 people die in the United States each year as a result of exposure to secondhand smoke. The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past, scientists did not think that these chemicals could harm a nonsmoker's health. {{U}} {{U}} 3 {{/U}} {{/U}}They discovered that even nonsmokers had unhealthy amounts of these toxic (有毒的) chemicals in their bodies. As a matter of fact, almost all of US breathe tobacco smoke at times, whether we realize it or not. For example, we cannot avoid secondhand smoke in restaurants, hotels and other public places. Even though many public places have nonsmoking areas, smoke flows in from the areas where smoking is permitted. It is even harder for children to avoid secondhand smoke. {{U}} {{U}} 4 {{/U}} {{/U}}Research shows that children who are exposed to secondhand smoke are sick more often than children who live in homes where no one smokes and that the children of smokers are more than twice as likely to develop lung cancer when they are adults as are children of nonsmokers. The risk is even higher for children who live in homes where both parents smoke. People are becoming very aware of the dangers of secondhand smoke. {{U}} {{U}} 5 {{/U}} {{/U}} A. Recently, though, scientists changed their opinion after they studied a large group of nonsmokers. B. The Gilsons have been married for 35 years. C. This smoke is called secondhand smoke. D. However, secondhand smoke is dangerous to all people, old or young. E. As a result, they have passed laws which prohibit people from smoking in many public places. F. In the United States, nine million children under the age of five live in homes with at least one smoker.

填空题Stanford University attracts students from ______.

填空题A. in or near the familyB. when it is known the victim took too much of what is called a general poisonC. on the advice of a medical expertD. a sudden pain or sickness, bums or an unusual smell coming from a person's mouthE. a strong acid or a strong alkaliF. the distinction between life and death

填空题If you had no one to share your feelings, your life would be ______.

填空题Chest Compressions: Most Important of CPR Cardiopulmonary resuscitation, or CPR, can save the life of someone whose heart has stopped. The condition is called cardiac arrest. The heart stops pumping blood. The person stops breathing. Without lifesaving measures, the brain starts to die within four to six minutes. CPR combines breathing into the victim"s mouth and repeated presses on the chest. 1 . However, a new Japanese study questions the usefulness of mouth-to-mouth breathing. The study was published in the British medical magazine, The Lancet. Doctors in Tokyo led the research. It examined more than four thousand people who had suffered cardiac arrest. In all the cases, witnesses saw the event happen. More than one thousand of the victims received some kind of medical assistance from witnesses. Seven hundred and twelve received CPR. Four hundred and thirty-nine received chest presses only. 2 The researchers say any kind of CPR improved chances of the patient"s survival. But, they said those people treated with only chest presses suffered less brain damage. Twenty-two percent survived with good brain ability. 3 . The American Heart Association changed its guidelines for CPR chest presses in 2005. 4 Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson. He wrote a report that appeared with the study. Doctor Ewy thinks the CPR guidelines should be changed again. He said the heart association should remove rescue breaths from the guidelines. He argues that more witnesses to cardiac arrests would provide treatment if rescue breaths are not a part of CPR. He says this would save lives 5 . Cardiac arrest kills more than 300,000 people in the United States every year. The American Heart Association says about ninety-five percent of victims die before they get to a medical center. A. So far, we have not known exactly yet whether mouth-to-mouth breathing is really useless in CPR. B. Only ten percent of the victims treated with traditional CPR survived with good brain ability. C. CPR keeps blood and oxygen flowing to the heart and brain. D. His studies show that many people do not want to perform mouth-to-mouth breathing on a stranger for fear of getting a disease. E. It said people should increase the number of chest presses from fifteen to thirty for every two breaths given. F. No mouth-to-mouth rescue breaths were given to them.