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  3. Sprained Ankle One of the most common injuries teenagers and adults experience is a sprained ankle. A sprain occurs when the

Sprained Ankle One of the most common injuries teenagers and adults experience is a sprained ankle. A sprain occurs when the

admin2012-09-29  43
问题                          Sprained Ankle
    One of the most common injuries teenagers and adults experience is a sprained ankle. A sprain occurs when the ligaments (韧带) of a joint are twisted (扭伤) and possibly torn. Ligaments are bands of fibers that hold the bones of a joint in position. A sprain can occur from a sudden twisting at the joint, or a stretching or tearing of the fibers of the ligaments. The injured area usually swells (肿胀) and becomes black and blue. Stepping off the sidewalk at the wrong angle or having one foot land in a hole while walking or running can leave you rolling on the ground in pain with an ankle on fire! If you cannot walk with experiencing intense pain, you must seek medical help. If the pain is manageable, and you can walk, here are three words to help you remember how to treat yourself:
    Elevate (抬高)
    Cool
    Bandage (打绷带)
    As soon as there is injury to that ligament, there will be a certain amount of bleeding under the skin. Once the blood pools around the damaged blood vessels, swelling occurs. The pressure from the swelling results in additional stress and tenderness to the region. In order to reduce the degree of swelling, lie down as soon as possible and keep the ankle elevated so that it is actually higher than your heart. Next, to reduce blood distribution and keep bleeding(流血) to minimum, apply a cold pack. After 20 minutes, take the pack off, wait half an hour, and then reapply. This can be several times a day for a total of three days.
    Never leave a cold pack on for more than 20 minutes at a time. Reducing the temperature in that area for an extended period of time signals the body to increase blood flow to raise the body temperature! Therefore, one accidentally triggers (引起) more blood distribution to the affected area by leaving a cold pack on for too long! Finally, bandage the angle. Be careful not to wind it too tightly; doing so can restrict blood flow and cause harm to the entire foot.
The black-and-blue symptom of a sprain is due to______.
选项 A、pressing one’s ankle
B、a tight bandage
C、applying a cold pack
D、bleeding under the skin
答案D
解析 推断题。第一段第五句：受伤部位通常会肿胀, 变得青一块紫一块。由此可知肿胀使得皮肤青一块紫一块。由此可知：第二段前两句：一旦韧带受伤, 那么皮肤下面就会有一定的流血。一旦血聚集在受伤的血管周围, 就会发生肿胀。由此可知肿胀是由于血液聚集在受伤的血管周围。因此皮肤变得青一块紫一块是由于皮肤下面的流血而导致的。
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