Such enterprises today are regarded by many middle－aged persons as bad for the heart.But a well－known British physician，Sir Adolphe Abrahams，pointed out recently that hearts and bodies need proper exercise.A person who avoids exercise is more likely to have illnesses than one who exercises regularly.And walking is an ideal form of exercise—the most familiar and natural of all.

　　It was Henry Thoreau who showed mankind the richness of going on foot.The man walking can learn the

　　trees，flowers，insects，birds and animals，the significance of seasons，the very feel of himself as a living creature in a living world.He cannot learn in a car.

　　The car is a convenient means of transport，but we have made it our way of life.Many people don’t dare to approach Nature any more；to them the world they were born to enjoy is all threat.To them security is a__steel__river thundering on a concrete road.And much of their thinking takes place while waiting for the traffic light to turn green.

　　I say that the green of forests is the mind’s best light.And none but the man on foot can evaluate what is basic and everlasting.

　　【语篇导读】　本文是一篇议论文。主要强调现代人过度依赖交通工具，而忽略了最好的锻炼方式——步行，作者呼吁大家改掉动辄坐车开车的坏毛病，返璞归真，回归自然健康的生活方式。

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