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Text 3 Injuries can happen at any time, any place. When they do occur everyone likes to get the best treatment to help them heal quickly and properly. For athletes, the need to receive proper medical care is crucial in order for them to continue their sports careers. Athletes depend on the knowledge of doctors who are specially trained in sports medicine, which is a field of medicine that has grown rapidly since 1950s. Sports medicine is more than just the treatment of injuries. It is also concerned with the prevention of injuries, the maintaining of a proper diet, the creation of individual exercise programs for an athlete and the mental preparation of the athlete. In general, sports medicine is relevant to all aspects of monitoring athletes while they are in training. The field of sports medicine includes nutrition, surgery, physical therapy, research, and orthopedics, which is the correction or cure of disease or deformities of bones, joints and muscles. The doctors who specialize in sports medicine are called sports traumatologists. These experts’ specialize in the care of injuries to the musculoskeletal system. They do physical examination, diagnose injuries, and refer patients to surgeons if necessary. Although people have been interested in sports medicine for many years, it actually became more specialized after World War Ⅱ, with great developments in the 1960s and 1970s. The modem idea of complete care for the athlete emerged from the widespread surge in sports participation over this time period. The field of sports medicine is very broad because there are so many types of sports injuries and because each individual athlete’s body is different-their make-up, build, immune system, etc. Because of this, virtually every injury is treated in a different way. As injuries continue to occur and the sports medicine field grows, recovery methods are becoming more advanced. Two of the more modern methods of treatment are the hyperbaric chamber and magnetic resonance imaging. A hyperbaric chamber is a cylindrical steel tube into which a person can enter. Inside the chamber, the athlete is exposed to high levels of oxygen. This promotes oxygenation of the blood and speeds recovery time. Use of magnetic resonance imaging (MRI) in medicine began in the early 1980s. MRI presents a hazard-free way to get images of thin slices of the body and a reliable method of detecting injuries. It is a superior imaging technique because it doesn’t use radiation or need any special dyes. MRI uses magnets to concentrate and focus on small areas of the body, which produces detailed images. Besides being used to diagnose sports injuries, MRI is capable of producing high-contrast pictures of the brain, heart, liver, kidneys and can detect things such as tumors. It is quite possible that with the increased interest in sports, the field of sports medicine will become even more specialized. Sports medicine continues to grow and take care of the needs of athletes from the professional playing in front of a stadium full of people to the person working out at their local health club. Which of the statements is TRUE
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Text 1 If you are tired of watering your plants every day, you might want to try growing them right in the water. And in fact this is not a new idea: People in ancient Egypt were growing plants without soil more than 2,000 years ago. Moreover, the floating gardens of the Aztecs in early Mexico are another ancient example of gardening without soil. Nowadays this technique is widely used. It is called hydroponic gardening. Literally, the term hydroponics means cultivating in water rather than in soil, and in fact normal soil is not used in this process. But plants are plants, and so the concerns of the hydroponic gardener are really much the same as those of any other farmer. Even when they do not grow in soil, all plants need food, stability, oxygen, and protection from disease. The main nutrients required by plants are nitrogen, potassium, and phosphorus. Also, small amounts of other elements are needed. In the ancient hydroponic gardens of Egypt and Mexico, the growers had to rely on minerals that occurred naturally in the water. In modem hydroponic applications, workers carefully add these important minerals to pure water; in this way, the balance of waterborne nutrients can be controlled, depending on the kind of plants being grown and on the speed of growth of the crop. Plants usually get stability from the soil around their roots. Obviously, water cannot provide this. Plants farmed hydroponically are supported either by growing through a mesh over the Water, or by sinking their roots into sand or pea-sized gravel soaked in water. Either way, the plants stay upright, with their leaves exposed to the sun. They need no soil because, in this system, they do not derive nutrients from the medium that gives them stability. Oxygen is another essential requirement. The roots as well as the leaves of all plants must be able to breathe. If insufficient oxygen reaches its roots, a plant will die. To fulfill this need, hydroponic farmers usually keep the nutrient water flowing all the time. As the water circulates, it is aerated by splashing from one container to another: The splashing process increases the amount of absorbed air in the water. Finally, plants need a healthy environment. Especially when plants of the same species are grown close together, there is a real danger that diseases may spread quickly. A very clean growing medium will reduce this risk. Soil, the natural planting medium, may contain many harmful diseases or pests, but hydroponic gardening does not use soil. Starting with pure water and clean sand or gravel, the hydroponic gardener avoids many uncertainties. In these ways, hydroponics can overcome important agricultural challenges. For instance, hydroponic farming is able to produce worthwhile crops in regions where the soil is too poor for ordinary gardens, or where the supply of water is too scarce for normal irrigation. Also, even in fertile areas, hydroponic greenhouse makes it possible to cultivate small areas extremely densely: This can be very profitable during winter in cold climates, such as Canada or the Northern United States. Such considerations may not have mattered to the ancient Egyptians or Aztecs, but they are the basis of a thriving hydroponics industry today. Which word is closest in meaning to "fertile" (Paragraph 7)
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