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  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.【C2】________, 110 years is probably the longest that anyone could hope to live—if he or she is extremely healthy and lucky. Some scientists even say we can live as long as 130 years’. Yet, our cells simply cannot 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 lifespan (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 Sixty-five may be out of date as the【C6】________line between middle age and old age.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 decline【C7】________they are after the age of 75.
    People are living longer because more people【C8】________childhood. Before modern medicine changed the laws of nature, many children died【C9】________common childhood disease. Now the chances of dying【C10】________are much lower and 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,【C12】________some see chances, not disasters. Many men and women in their "golden years" are healthy, still active, and young in 【C13】________though not at a young age.
    As the society grows old, we need the contribution of our older citizens.【C14】________long lives ahead of them, they need to【C15】________active and dedicated.
【C3】
选项 A、slowly
B、harmlessly
C、endlessly
D、separately
答案C
解析 slowly：缓慢地；harmlessly：无害地，无恶意地；endlessly：不断地，无休止地；separately：分别地，单独地。根据句意并结合常识可知，此处表达的是“只不过我们的细胞不能无休止地繁殖”。故选C。
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