单项选择题

When the time comes for anthropologists to turn their attention to the twentieth century, they will surely choose the label "Legless Man". Histories of the time will go something like this: In the twentieth century, people forgot how to use their legs. Men and women moved about in cars, buses and trains from a very early age. But ’the surprising thing is that they didn’t use their legs even when they went on holiday. They built cable railways, ski-lifts and roads to the top of every huge mountain.
The future history books might also record that we were deprived of the use of our eyes. In
ourhurry to get from one place to another, we failed to see anything on the way. Air travel gives you a bird’s eye view of the world. When you travel by car or train a blurred image of the country- side constantly smears the windows. Car drivers, in particular, are forever obsessed with the urge to go on and on: they never want to stop.
When you travel at high speeds, the present, means nothing: you live mainly in the future because you spend most of your time looking forward to arriving at some other place. But actual arrival, when it is achieved, is meaningless. For the traveler on foot, on the other hand, traveling and arriving is the same thing: he arrives somewhere with every step he makes. At the end of his journey he feels a delicious physical weariness. He knows that sound. Satisfying sleep will be his: the just reward of all true travelers.

Traveling at high speed means（）

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