Do you want to live another 100 years or more? Some experts say that scientific advances w

Do you want to live another 100 years or more? Some experts say that scientific advances will one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.
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.
At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology（纳米技术）make 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 specialize in ageing 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 differ on what kind of life the super aged might live. It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life? said Leonard Pooh, director of the University of Georgia Gerontology(老龄学) 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 of 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 living foreverD．they are able to make people live past the present life span【小题2】Donald Louria's attitude towards long living is that .A．people can live from 120 to 180 yearsB．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（paragraph 4）refers to .A．a great pushB．the idea of living beyond the present life spanC．the idea of living from 200 to 300 yearsD．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

(答案→)C 解析：本文是一篇科技说明文。文章就“人的寿命是否可以更长”科学家发表了不同方面的意见。【小题1】C推理判断题。第二段Michaed Zey教授说 “我认为我们正在敲击永生之门，保守的估计，到2075年我们就会看到它的曙光”。由此可知他们有关于长生不老的一些想法。【小题2】D推理判断题。由第三段可知Donald Louria 对待长生的态度是乐观的，他认为在将来人们有长寿的可能。可以活120～180岁甚至更久，200～300岁。A项表述得太具体。【小题3】B 词义猜测词题。文章的前三个自然段讲述一些专家认为利用纳米和基因技术可以延长人类寿命，第四段则以However, many scientists who specialize in aging are doubtful about it…一句开头，转折说明许多科学家对此提出质疑，所以这个it指的是上文提出的观点。【小题4】A主旨大意题。通读短文可知全文都在谈论人类是否可以更长寿的问题。部分专家学者很乐观，也有部分专家并不这样看好。A项正好概括了这两个方面。文章虽提到了科学，技术，但它们只是作为人类可以长寿的论据出现的。因此B项不对。C项只是部分人的观点。

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