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阅读“七选五”训练 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Getting older No one really knows how and why people change as they get older. 36 Aging is a complex and varied process that varies in how it affects different people and organs. In fact, even in one person, different organ systems “age” at different rates. At a certain point in our lives our body systems will begin to weaken. 37 It may become more difficult for us 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. 38 A good diet plays an important role. The amount and the type of exercise we get are another two factors. 39 But scientists studying the 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. 40 Many consider the later part of life to be the best time for living. Physical activity may become less, but often we get better understanding of the world and ourselves. | 
