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 1

How long can human beings live? Most scientists who study old age think that the human body is【C1】______to live no longer than 1

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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 Sixty-five may be out-of-date as the【C6】______line between middle age and old age.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.
【C10】
选项 A、poor
B、young
C、sick
D、quiet
答案B
解析 句意：和以前相比，现在的人在年幼时死去的几率已经大大降低了。young与上文的childhood对应。故选B。
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