轻松学英语每日一练(290)
阅读下面短文，在空白处填入1个适当单词或括号内单词的正确形式。
Do you want to live another 100 years or more? Some experts say that scientific advances will one day __1__ (able) humans to last tens of years beyond __2__ is now seen as the natural limit of the human life span (时间跨度).
"I think we are __3__ (knock) at the door of immortality (永生)," said Michael Zey, __4__ 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 (保守的估计).
At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes (基因) as well as nanotechnology (纳米技术) make __5__ likely that humans will live in the future beyond what has been possible in the past. "There is a great push so __6__ 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 (老龄化) are __7__ (doubt) about it and say the human body is just not designed to last past about 120 years. Even with __8__ (healthy) lifestyles and less disease, they say failure of the brain and organs (器官) will finally lead all humans to __9__ (die).
Scientists also differ on (对……持不同意见) what kind of life the super aged might live. "It remains to be __10__ (see) (尚待分晓) if you pass 120, you know; could you be healthy enough to have good quality of life (生活质量)?" said Leonard Poon, director of the University of Georgia Gerontology(乔治亚大学老年医学中心). "At present who could get to that point are not in good health at all."
