Race walking shares many fitness benefits with running, research shows, while most likely contributi

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A
Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.
Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport's rules require that a race walker's knees stay straight through most of the leg swing and one foot remain in contact(接触) with the ground at all times. It's this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.
Like running, race walking is physically demanding, she says. According to most calculations, race walkers moving at a pace of six miles per hour would burn  about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.
However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.
As a result, she says, some of the injuries associated with running, such as runner's knee, are uncommon among race walkers. But the sport's strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.
1.Why are race walkers conditioned athletes?
A.They must run long distances.
B.They are qualified for the marathon.
C.They have to follow special rules.
D.They are good at swinging their legs.
2.What advantage does race walking have over running?
A.It's more popular at the Olympics.
B.It's less challenging physically.
C.It's more effective in body building.
D.It's less likely to cause knee injuries.
3.What is Dr. Norberg's suggestion for someone trying race walking?
A.Getting experts' opinions.
B.Having a medical checkup.
C.Hiring an experienced coach.
D.Doing regular exercises.
4.Which word best describes the author's attitude to race walking?
A.Skeptical.    B.Objective.
C.Tolerant.    D.Conservative.
A
【语篇解读】 本文为说明文,主题语境是人与社会,主题语境内容是竞走运动。文章介绍了竞走运动的特点及其利弊。文章旨在培养学生了解运动,认识体育,积极、科学地参加体育活动的品质。
1.C 推理判断题。本题题干意为:为什么竞走运动员是受制约的运动员?根据文章的第二段可知,竞走运动有非常特殊的动作要求,所以C项(他们不得不遵守特别的规则)正确。A:他们必须跑长距离;B:他们有跑马拉松的资格;D:他们善于摆腿。
2.D 细节理解题。本题题干意为:和跑步相比,竞走有什么优势?根据文章最后一段的第一句可知,一些和跑步相关的身体损伤,如膝盖损伤,在竞走中就不常见,故D项正确。A:它在奥运会中更受欢迎;B:它对身体的要求更小;C:它对健身更有效果。
3.A 细节理解题。本题题干意为:Norberg博士对想尝试竞走的人的建议是什么?根据文章最后一段的倒数第二句话可知,博士认为,任何一个想尝试竞走运动的人都要先向教练或有经验的竞走运动员学习正确的技巧。故A项正确。B:做医疗检查;C:雇一个有经验的教练;D:经常锻炼。
4.B 推理判断题。本题题干意为:哪个单词可以最准确地描述作者对竞走的态度?在文章中,作者客观地介绍了竞走运动的特点以及优缺点。因此B项(客观的)正确。A:怀疑的;C:宽容的;D:保守的。
 
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