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.

　　51. What is the national sickness?

　　A. Walking too much.

　　B. Travelling too much.

　　C. Driving cars too much.

　　D. Climbing stairs too much.

　　52. What was life like when the author was young?

　　A. People usually went around on foot.

　　B. People often walked 25 miles a day.

　　C. People used to climb the Statue of Liberty.

　　D. People considered a ten­hour walk as a hardship.

　　53. The author mentions Henry Thoreau to prove that________.

　　A. middle­aged people like getting back to nature

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