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  3. As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will

As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will

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问题     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 come 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.
When people become aging, they will lose some of their ability to bounce back from disease and injury, "bounce back" here means______．
选项 A、to improve in health after one’s disease and injury
B、to recover from disease and injury
C、to jump after recovering
D、to run fast
答案A
解析 人体随着年龄的增长，身体各系统不断变化，衰老的缓慢发展使机体失去了对疾病和伤害做出反应的某些能力。
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