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 wed 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 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.

　　B) More and more people in the US today want to get married.

　　C) Living longer would make it easier for people to maintain their marital ties.

　　D) If people live longer，they would stay in marriage longer.

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