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何为电极法？表示电极法的基本公式是什么？
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A. evaporation B. water cycle C. Complicated process D. ever-going-on process E. rainfall F. ground water G. vapor H. transpiration I. high land J. formation of clouds K. formation of rain L. cold air M. drops of rain N. absorbed by soil O. porous rock layer P. non-porous rock layer Q. accumulation of water R. process of water cycle 蒸发作用( ) 云的形成( )
People faint (晕) when the normal blood supply to the brain is suddenly cut down. This can happen if they are surprised or shocked by sudden news or by something they see. Some people faint if they see others hurt. Some people faint in crowds. Others faint if they are in a room that is hot and with all the windows closed. If a person faints while standing, lay him down. If his face is pale, lift his feet. If he is sitting down when he faints, place his head between his knees. Loosen any tight clothing that might keep him from breathing easily. If possible, place cold, wet cloth on his forehead. The passage says that people may faint if they are______.
As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will begin to weaken. Your strength may become weaker. It may become more difficult for you to see and hear. The slow change of aging causes our bodies to lose some of their ability to bounce back from disease and injury. In order to live longer, we have always tried to slow or stop this change that leads us toward the end of our lives. Many factors decide your health. A good diet plays an important role. The amount and type of exercise you get is another factor. Your living condition is yet another. But scientists studying aging problem want to know: Why do people grow old They hope that by studying the aging medical science they may be able to make the length of life longer. There is nothing to be afraid of as old age comes. Many consider the later part of life to be the best time for living. Physical activity may become less, but often you get better understanding of yourself and the world. What we consider old age now may only be middle age some day soon. Who knows, with so many advances in medical science happening so quickly, life span may one day be measured in centuries, rather than in years. Why are some scientists interested in studying aging problem
In the future man will have computers ______ many kinds of work. (do)
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