2. 公务员
  3. How long can human beings live? Most scientists who study old age think that the human body is【C1】________to live no longer than

How long can human beings live? Most scientists who study old age think that the human body is【C1】________to live no longer than

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问题     How long can human beings live? Most scientists who study old age think that the human body is【C1】________to live no longer than 120 years.   However, 110 years is probably the longest that anyone could hope to live - if he or she is【C2】________healthy and lucky. Some scientists even say we can live as long as 130 years! Yet, our cells simply cannot continue to reproduce【C3】________They wear out, and as a result,  we get old and【C4】________die.
    Even though we can’t live forever, we are living a【C5】________life than ever before. In 1900, the average American life span (寿命) was only 47 years, but today it is 75 years!
    When does old age begin then? Sixty-five may be out-of-date as the【C6】________line between middle age and old age. After all, many older people don’t begin to experience physical and mental【C7】________until after age 75.
    People are living longer because more people【C8】________childhood. Before modern medicine changed the laws of nature, many children died of common childhood【C9】________Now that the chances of dying【C10】________are much lower, the chances of living long are much higher due to better diets and health care.
    On the whole, our population is getting older. The【C11】________in our population will have lasting effects on our social development and our way of life. Some people fear such changes will be for the worse, while some see【C12】________, not disaster. Today, many men and women in their " golden years" are healthy, still active, and young in【C13】________if not in age.
    As our society grows old, we need the【C14】________of our older citizens. With long lives ahead of them, they need to【C15】________active and devoted.
【C8】
选项 A、survive
B、enjoy
C、remember
D、value
答案A
解析 根据本段第二句可知，现在人们寿命更长的原因是更多的人在童年时期活了下来，故选A。
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