2. 考研
  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 joints may become stiff. 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 process that leads us toward the end of our lives.
    Many factors contribute to your health. A well-balanced diet plays an important role. The amount and type of exercise you get is another factor. Your living environment and the amount of stress you are under is yet another. But scientists studying senescence (衰老) want to know: Why do people grow old? They hope that by examining the aging process on a cellular level medical science may be able to extend the length of life.  
This passage is mainly concerned with ______.
选项 A、man’s aging process
B、man’s life span
C、man’s health
D、man’s medical care
答案A
解析 本题的关键是找到主题句，确定短文的中心思想。一般而言，主题句是文章的第一个句子。此题的正确选项是A，符合主题句的意思。其他的选项都是本短文的细节信息。
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