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    10．What will people die of 100years from now？If you think that is a simple question，you have not been paying attention to the revolution that is taking place in biotechnology （ 生物技术 ）．With the help of new medicine，the human body will last a very long time．Death will come mainly from accidents，murder and war．Today's leading killers，such as heart disease，cancer，and aging itself，will become distant memories．
    In discussion of technological changes，the Internet gets most of the attention these days．But the change in medicine can be the real technological event of our times．How long can humans live？Human brains were known to decide the final death．Cells are the basic units of all living things，and until recently，scientists were sure that the life of cells could not go much beyond 120years because the basic materials of cells，such as those of brain cells，would not last forever．But the upper limits will be broken by new medicine．Sometime between 2050and 2100，medicine will have advanced to the point at which every 10years or so，people will be able to take medicine to repair their organs．The medicine，made up of the basic building materials of life，will build new brain cells，heart cells，and so on，in much the same way our bodies make new skin cells to take the place of old ones．
    It is exciting to imagine that the advance in technology may be changing the most basic condition of human existence，but many technical problems still must be cleared up on the way to this wonderful future．

    21．According to the passage，human death is now mainly caused byA．
    A．diseases and aging   B．accidents and war
    B．accidents and aging  D．heart disease and war
    22．Humans may live longer in the future becauseD．
    A．heart disease will be far away from us
    B．human brains can decide the final death
    C．the basic materials of cells will last forever
    D．human organs can be repaired by new medicine
    23．We can learn from the passage thatC．
    A．human life will not last more than 120years in the future
    B．humans have to take medicine to build new skin cells now
    C．much needs to be done before humans can have a longer life
    D．we have already solved the technical problems in building new cells．

    分析 本文是一篇医学科普题材的文章．介绍了在未来，由于医学的高度发达，人类的寿命将会更加长久．

    解答 21：A．细节理解题．由文章第一段Today's leading killers，such as heart diseases，cancer，and aging itself…（现在人类死亡的头号杀手：诸如心脏病、癌症以及衰老…）可知现在人类死亡的主要原因是心脏病、癌症和衰老；故选A．
    22：D．推理判断题．根据第二段倒数第二句"sometime between 2050 and 2100，…people will be able to take medicine to repair their organs"在2050～2100期间，每隔10年左右，人们可以通过吃药来修复生病的或衰老的器官．可知这应是未来寿命更长的原因，结合选项，故选D．
    23．C 主旨大意题． 根据最后一段的"but many technical problems still must be cleared up on the way to this wonderful future"可知，在通往未来的路上，还有许多科技问题需要解决．故选C．

    点评 本文是科技类阅读理解．做这类题材阅读理解时要求考生对文章通读一遍，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据

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