完形填空 How long can human beings live? Most scientists who study old age think that the human body is

10-25
摘要: 完形填空
阅读下面短文,从短文后各题所给的A、B、C和D四个选项中选出可以填入空白处的最佳选项。
How long can human beings live? Most scientists who study old age thin
完形填空
阅读下面短文,从短文后各题所给的A、B、C和D四个选项中选出可以填入空白处的最佳选项。
How long can human beings live? Most scientists who study old age think that the human body is ___17___ 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 ___18___ healthy and lucky. Some scientists even say we can live as long as 130 years! Yet, our cells simply cannot continue to reproduce ___19___. They wear out, and as a result, we get old and ___20___ die.
Even though we can’t live forever, we are living a ___21___ 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 Sixty-five may be out-of-date as the ___22___ line between middle age and old age. After all, many older people don’t begin to experience physical and mental ___23___ until after age 75.
People are living longer because more people ___24___ childhood. Before modern medicine changed the laws of nature, many children died of common childhood ___25___. Now that the chances of dying ___26___ 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 ___27___ 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 ___28___, not disaster. Today, many men and women in their "golden years" are healthy, still active, and young in ___29___ if not in age.
As our society grows old, we need the ___30___ of our older citizens. With long lives ahead of them, they need to ___31___ active and be devoted.
17. A. designed B. selected C. improved D. discovered
18. A. completely B. generally C. apparently D. extremely
19. A. rapidly B. harmlessly C. endlessly D. separately
20. A. eventually B. hopelessly C. automatically D. desperately
21. A. busier B. longer C. richer D. happier
22. A. finishing B. guiding C. waiting D. dividing
23. A. stress B. damage C. decline D. failure
24. A. survive B. enjoy C. remember D. value
25. A. problems B. fears C. worries D. diseases
26. A. poor B. young C. sick D. quiet
27. A. changes B. recovery C. safety D. increases
28. A. dreams B. chances C. strengths D. choices
29. A. mind B. appearance C. voice D. movement
30. A. protection B. suggestions C. contributions D. permission
31. A. sound B. appear C. turn D. stay
【答案】17. A    18. D    19. C    20. A    21. B    22. D    23. C    24. A    25. D    26. B    27. A    28. B    29. A    30. C    31. D
【解析】
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