　　On the other hand，more people working for longer would create greater competition for jobs.It would make it more difficult for younger people to find a job.Top posts would be dominated by the same few individuals，making career progress more difficult.And how easily would a 25-year-old employee be able to communicate with a 125-year-old boss?

　　Young people would be a smaller part of a society in which people lived to 140.It may be that such a society would place less importance on guiding and educating young people，and more on making life comfortable for the old.

　　And society would feel very different if more of its members were older.There would be more wisdom，but less energy.Young people like to move about.Old people like to sit still.Young people tend to act without thinking.Old people tend to think without acting.Young people are curious and like to experience different things.Old people are less enthusiastic about change.In fact，they are less enthusiastic about everything.

　　The effect of anti-ageing technology is deeper than we might think.But as the science advances，we need to think about these changes now.

　　“If this could ever happen，then we’d better ask what kind of society we want to get，”says Daniel Callahan.“We had better not go anywhere near it2 until we have figure those problems out.”

　　词汇：mice/maIs/n.老鼠 (复数) bioethicist/7aIE5WIsIst/n.生物伦理学家 sibling/5sIblIN/n.兄弟姐妹

　　注释：1.　brothers and sisters born 50 years apan 出生年份才目隔50年的兄弟姐妹

　　2.　We had better not go anywhere near it 我们最好离它远点，这里的it指代前面讲的 anti-ageing technology。

　　练习：　1.　Which of the following is NOT mentioned as one of the things that living longer might enable an individual to do?

　　A) Spending more time with his family.

　　B) Having more education.

　　C) Realizing more dreams.

　　D) Working longer.

　　2.　Which of the following is implied in the sixth paragraph?

　　A) Marriages in the US today are quite unstable.

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