Sports medicine experts have observed for years that athletes such as long dis
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Sports medicine experts have observed for years that athletes such as long distance runners, especially women athletes, often display a lack of iron. Now a new study by a team of Purdue University researchers suggests that even moderate exercise may lead to reduced iron in the blood of women.
"We found that women who were normally inactive and then started a program of moderate exercise of middle degree showed sings of iron loss," says Roseanne M. Lyle, associate professor at Purdue. Her study of 62 formerly inactive women who began exercising three times a week for six months was published in the journal Medicine & Science in Sports & Exercise.
Iron deficiency is very common among women in general, affecting one in four female teenagers and one in five women aged 18 to 45, respectively. But the ratio is even greater among active women, affecting up to 80 percent of female endurance athletes. This means, Lyle says, that "too many women ignore the amount of iron they take in". Women of child-bearing age are at greatest risk, since their monthly bleeding is a major source of iron loss. Plus, many health-conscious women increase their risk by rejecting red meat, which contains the most easily absorbed form of iron. And because women often restrict their diet in an effort to control weight, they may not consume enough iron-rich food, and are liable to experience a deficiency.
Exercise can result in iron loss through a variety of mechanisms. Some iron is lost in sweat, and, for unknown reasons, intense endurance exercise is sometimes associated with bleeding of the digestive system. Athletes in high-impact sports such as running may also lose iron through a phenomenon where small blood vessels in the feet leak blood.
There are three stages of iron deficiency. The first and most common is having low iron reserves, a condition that typically has no symptoms. Fatigue and poor performance may begin to appear in the second stage of deficiency, when not enough iron is present to form the molecules(分子) of blood protein that transport oxygen to the working muscles. In the third and final stage, people often feel weak, tired, and out of breath - and exercise performance is severely compromised.
"People think that if they"re not at the third stage, nothing is wrong, but that"s not true," says John L. Beard, who helped design the Purdue study. "You"re not stage 3 until your iron reserves go to zero, and if you wait until that point, you"re in trouble."
Beard and other experts say it’s advisable for people to have a yearly blood test. If iron levels are low, talk with a physician to see if the deficiency should be corrected by changing your diet and taking iron-rich foods or by taking iron-added pills.
“Select breads and cereals with the words ‘iron-added’ on the label,” writes sports diet expert Nancy Clark. “This added iron supplements the small amount that naturally occurs in grains.” Clark also recommends cooking in iron pans, as food can obtain iron from the pan during the cooking process.
64．Which of the following may be the title for the passage?
A．Science, sports and exercise
B．Correct iron deficiency
C．Women, Iron and exercise
D．Women, health and exercise
65．The third paragraph is developed mainly by________ .
A．organizing the details according to the order of time
B．presenting the result followed by specific causes
C．beginnign with details followed by a general statement
D．making comparisons ad contrasts
66．What does it mean when you are in the third stage of iron defieiency?
A．Nothing serious though you don’t have much iron stored in the body.
B．There is not enough iron to form the molecules of blood protein to transport oxygen.
C．The small blood vessels in your reet are beginnig to leak blood.
D．No iron is left in your body and you would be in trouble without urgent measures.
67．What is the writer’s attitude in writing this passage?
A．Defensive. B．Persuasive. C．Supportive. D．Objective. |
答案
64-67 CBDD |
解析
| 略 |
举一反三
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. Without being told about options for diabetes, she said. “Doctors don’t feel they have good information to give. They felt 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 at 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 obesity-related diseases like hypertension and diabetes.
Dr. William Bestermann Jr., medical director of Holston Medical Group, in Kingsport, Tenn., which ranks 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 going to be successful with helping your patients lose weight, you’re going to have to talk to them at virtually every visit about their progress, and find something to encourage them about, find progress in some aspect of their care and coach them,” he said.
He acknowledged that many doctors tend to be optimistic.
“Part of this is that there’s this common belief, and doctors are burdened by it, too, that heavy people are weak-willed and just don’t have any willpower and are self-indulgent and all that business,” he said. “If you think that way, you’re not going to spend time having a productive conversation.”
61．What is most probably the Stop Obesity Alliance, as in Paragraph 3?
A．An organization of doctors specializing in obesity.
B．An organization of patients suffering from obesity.
C．A research group that conducts special surveys about overweight people.
D．A research group dealing with doctor – patient relationship.
62．How many of the patients surveyed have been advised by their doctors to lose weight?
A．About 350. B．About 390. C．About 900. D．1,000.
63．What can be inferred about obesity patients in Paragraph 5?
A．They are not as hopeless as doctors think they are.
B．Most of them have tried hard to lose weight, but in vain.
C．Without their doctors’ constant coaching, there is little chance of their succeeding in losing weight.
D．Most of them have just given up their hope of becoming less heavy.
64．According to the passage, which factor contributes to the lack of dialogue between doctors and patients?
A．Most doctors just never think of warning their patients about their weight problem.
B．Many doctors find it difficult to persuade overweight people to lose weight.
C．Most patients are too weak – willed to do anything about their weight.
D．Many patients tend not to trust their doctors about their weight problem.
65．Which of the following is the best title of the passage?
A．Obesity in the U.S.
B．Trouble of overweight Americans
C．Talk more, help better
D．Doctors or patients – who to bear more blame? |
Sports can help you keep fit and get in touch with nature .However, whether you are on the mountains, in the waves, or on the grassland, you should be aware that your sport of choice might have great influence on the environment.
Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside, but also tons of water. Besides, all sorts of chemicals and huge amounts of energy are used to keep its courses（球场） in good condition. This causes major environmental effects. For example, in the dry regions of Portugal and Spain, golf is often held responsible for serious water shortage in some local areas.
There are many environment-friendly sports. Power walking is one of them that you could take up today. You don’t need any special equipment except a good pair of shoes; and you don’t have to worry about resources and your purse. Simple and free, power walking can also keep you fit. If you walk regularly, it will be good for your heart and bones. Experts say that 20 minutes of power walking daily can make you feel less anxious, sleep well and have better weight control.
Whatever sport you take up, you can make it greener by using environment-friendly equipment and buying products made from recycled materials. But the final goal should be “green gyms”. They are better replacements for traditional health clubs and modern sports centers. Members of green gyms play sports outdoors, in the countryside or other open spaces. There is no special requirement for you to start your membership. And best of all, it’s free.
64. Which of the following is the author most probably in favor of?
A. Cycling around a lake. B. Motor racing in the desert.
C. Playing basketball in a gym. D. Swimming in a sports center.
65. What do we know about golf from the passage?
A. It is popular in Portugal and Spain.
B. It causes water shortages around the world.
C. It pollutes the earth with chemicals and wastes.
D. It needs water and electricity to keep its courses green.
66. The author uses power walking as an example mainly because______.
A. it is an outdoor sport B. it improves our health
C. it uses fewer resources D. it is recommended by experts
67. The author writes the passage to_______.
A. show us the function of major sports
B. encourage us to go in for green sports
C. discuss the major influence of popular sports
D. introduce different types of environment-friendly sports |
Want to lose weight? Try eating. That’s one of the ways being developed by scientists experimenting with foods that trick the body into feeling full.
At he Institute of Food Research in Norwich, England, food expert Peter Wilde and his colleagues are developing foods that slow down the digestive system, which then sends a signal to the brain that stops appetite. “That fools you into thinking you’ve eaten far too much when you really haven’t,” said Wilde. From his studies on fat digestion, he said it should be possible to make foods, from bread to yoghurt, that make it easier to diet. While the research is still in its early stages, Wilde’s approach to controlling appetite is one that some doctors say could be a key to solving the problem of obesity.
“Being able to switch off appetite would be a big help for people having trouble losing weight,” said Steve Bloom, a professor of investigative medicine at London’s Imperial College, who is not connected to Wilde’s research. Bloom said that regulating appetite through foods is theoretically possible. But Bloom warned that controlling appetite may be very challenging. “The body has lots of things to prevent its regulatory systems from being tricked,” he said.
Wilde’s research makes use of the body’s ways of digesting fat. Fat normally gets broken down in the first part of the small intestines (肠道). When you eat a high-fat meal, however, the body can only digest the fat entirely further down in the intestines, which then causes the body to produce a kind of chemical to stop the appetite.
Wilde’s approach copies what happens with a high-fat meal. He coats fat droplets (滴) in foods with modified proteins from plants, so it takes longer for the chemical that breaks down fat to reach it. That means that the fat isn’t digested until it hits the far reaches of the intestines. At that point, intestinal cells send a signal telling the brain it’s full. Even though the body hasn’t had a high-fat meal, it stops the appetite as if it has. If the fat had been digested earlier in the intestines, no such signal would be sent.
51. According to Wilde’s research, what could people do if they want to lose weight?
A. Eat more bread and yoghurt. B. Trick the body by eating nothing.
C. Have foods with fat droplets coated. D. Control their digestive system strictly.
52. The underlined word “obesity” in Para. 2 most probably means “________”.
A. being too fat B. eating too much food
C. stopping appetite D. being unhealthy
53. What can be inferred about Professor Bloom’s opinion towards Wilde’s approach?
A. It won’t work since the body’s regulatory systems will never be tricked.
B. It is sure to switch off the appetite of people with a weight problem.
C. It sounds terrible because regulating appetite through foods is not practical at all.
D. It’s no that easy to trick the body so more research should be done.
54. Which of the following is TRUE about Wilde’s approach?
A. A kind of chemical is added to make a high-fat meal less fatty.
B. Fat is digested earlier and the body sends a signal telling the brain it’s full.
C. Fat won’t get broken down in the first part of the small intestines.
D. The chemical that breaks down fat will not reach the fat.
55. The passage is written to ________.
A. give advice on how to stop eating high-fat meals
B. introduce a research on controlling appetite
C. discuss the argument between two professors
D. show different ways to trick the body |
六．完形填空（20分）
More than fifty SARS experts ___1___ this month in Geneva at the headquarters of the World Health Organization. They came from fifteen countries to discuss progress ___2___ the lung disease. SARS began in southern China late last year. It ___3___ in Asia and other parts of the world. The W-H-O __4_____ travel warnings. Health officials worked aggressively. They kept SARS patients ____5___ others. They looked for anyone else those patients might have been near.
SARS was contained(遏制) in the middle of this year. By then, eight-thousand people had become sick. More than seven-hundred of ___6____ died.
SARS causes effects similar to ____7___ of pneumonia (肺炎) or influenza. People often cough. Breathing is difficult or ___8____ . Some people need machines to help them breathe. Body temperature goes ___9____ . SARS can also make people feel tired, __10_____ their head hurt and make them not want to eat. Most people with SARS, however, usually recover within two weeks.
1. A. met B. will meet C. saw D. will see
2. A. for B. against C. on D. from
3. A. took place B. spreaded C. take place D. spread
4. A. decided B. declared C. announced D. spoke
5. A. near B. together with C. away from D. close to
6. A. whom B. who C. them D. men
7. A. them B. that C. this D. those
8. A. hurt B. hurtful C. painful D. pain
9. A. down B. away C. up D. to zero
10. A. make B. having made C. making D. made |
This is a dangerous world we live in. The numbers of murders goes up every year； people are dying of cancer；more people contract（感染）HIV；more teens are using drugs；etc. You know this because you’ve heard all the statistics on the news. But do you really have an accurate idea what they mean? The numbers are going up, but how do they compare to the growth in population? Are more cases of these diseases being reported because of better testing techniques, or are the diseases more common? The fact is that without knowing the background, statistics mean very little.
This growing trend of reporting only part of the information is becoming dangerous.
For example, several years ago a high school student reported dangers of the chemical known as dihydrogen monoxide. This chemical, found in most cancerous tumors（肿瘤）， is found in the blood of people drunk on alcohol, and causes complete physical and mental dependence for those who take the chemical even once. After reading his report, more than 75% of his Advanced Placement Chemistry class voted to forbid this dangerous chemical! Every one of the above statements is true, yet this chemical is necessary to all life on earth. The students made the mistake because they voted knowing only a few statements and statistics, rather than the chemical’s full background.
The point of this article is that one should be aware of what is and is not being said. When one finds a new fact or number, one should try to consider other important information before forming an opinion with only half-truths. Always remember that the author is trying to convince you of his or her own view, and will leave out information that is different to his view. For example, look again at the statistics that suggest skiing is safe. Only 32 people may die each year when skiing, while 897 die from lightning strikes, but which is really more dangerous? If you think about it, you will realize far fewer people go skiing each year than the number of people who are in danger of a lightening strike. When you think about it, skiing is more dangerous than you might at first think when looking at statistics. If we teenagers are to be left in this world, we had better be able think critically, and form our own views. rather than be easily persuaded by another’s. To be warned is to be prepared.
59．In the first paragraph, what problem does the writer want to warn us?
A. We are now living in a dangerous world.
B. We got a lot of false statistics from the media.
C. There are around us more and more murders, diseases etc.
D. Statistics alone without full background don’t give us an accurate picture of things.
60．Why does the writer use the example in the second paragraph?
A. To show the danger of reporting only part of the information.
B. To argue that high school students are easily persuaded.
C. To prove what is necessary to us might be dangerous.
D. To warn us of the harmful substances（物质）around us.
61．Relative information is often left out because__________
A. relative information is not that important
B. the author is trying to show what he or she says is true
C. too much information will make readers feel confused
D. readers are not able to analyze so much information at once
62．What is the main idea of this passage?
A. Some measures must be taken to protect our dangerous world.
B. We should learn to think critically and look at problems from all sides.
C. The growing trend of reporting only half-truths is getting out of control.
D. Teenagers ought to improve their ability of telling right from wrong. |
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