Do you want to live another 100 years or more? Some experts say that scientific progress will one day help humans to last tens of years longer than what is now seen as the natural limit（限制）of the human life span（寿命）.
“ I think we are knocking at the door of immortality (永生),” said Michael Zey, a Montclair State University business professor and author of two books on the future. “ I think by 2075 we will see it and that’s a conservative estimate（保守估计）.”
At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said progress in using genes as well as nanotechnology（纳米技术）makes it likely that humans will live in the future beyond what has been possible in the past. “ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”
However, many scientists who research into aging are doubtful about it and say the human body is just not designed to last about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.
Scientists also disagree on what kind of life the super aged might live. “It remains to be seen whether you could be healthy enough to have good quality of life when you pass 120.” said Leonard Poon, director of the University of Georgia Gerontology Center. “ At present people who could get to that point are not in good health at all.”
【小题1】By saying “ we are knocking at the door immortality”, Michael Zey means .A．they believe that there is no limit of livingB．they are sure to find the truth about long livingC．they have got some ideas about long livingD．they are able to make people live beyond the present life span【小题2】Donald Louria’s attitude toward long living is that .A．people can live from 120 to 180B．it is still doubtful how long humans can liveC．the human body is designed to last about 120 yearsD．it is possible for humans to live longer in the future【小题3】The underlined “ it” (Para. 4) refers to . A．a great pushB．the idea of living beyond the present life spanC．the idea of living from 200 to 300D．the conservative estimate【小题4】What would be the best title for this text?A．Living longer or notB．Science, technology and long livingC．No limit for human lifeD．Healthy lifestyle and long livingC
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(答案→)C
解析：本文讲述的是科学家在研究人类是否能够活得更长更健康，以及不同的人对此问题的不同的反应。
【小题1】C 推理题。根据本句we are knocking at the door of immortality (永生),指我们敲响了永生的门，说明我们已经了解到了一些关于永生的秘密，结合第一段内容可知C正确。
【小题2】D 细节题。根据第二段最后3行“ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years说明他认为人类永生是有可能的，故D正确。
【小题3】B 推理题。这里的it就是指上一段里的“ There is a great push so that people can live from 120 to 180 years,” he said. “ Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.活的时间超过现在的预测。故B正确。
【小题4】A 主旨大意题。本文讨论的主要就是人类在未来是否可以活的更久一点，故A项正确。