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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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2018-08-01
4
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 Sixty-five may be out-of-date as the【C6】______line between middle age and old age.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.
【C13】
选项
A、mind
B、appearance
C、voice
D、movement
答案
A
解析
根据本句中的healthy,active和young可判断,其实所谓的“老年人”在精神上依然积极活跃,精力充沛,故选A。
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