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 （ 生物技術(shù) ）．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．a(chǎn)ccidents and war
B．a(chǎn)ccidents 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 本文是一篇醫(yī)學科普題材的文章．介紹了在未來，由于醫(yī)學的高度發(fā)達，人類的壽命將會更加長久．

解答 21：A．細節(jié)理解題．由文章第一段Today's leading killers，such as heart diseases，cancer，and aging itself…（現(xiàn)在人類死亡的頭號殺手：諸如心臟病、癌癥以及衰老…）可知現(xiàn)在人類死亡的主要原因是心臟病、癌癥和衰老；故選A．
22：D．推理判斷題．根據(jù)第二段倒數(shù)第二句"sometime between 2050 and 2100，…people will be able to take medicine to repair their organs"在2050～2100期間，每隔10年左右，人們可以通過吃藥來修復(fù)生病的或衰老的器官．可知這應(yīng)是未來壽命更長的原因，結(jié)合選項，故選D．
23．C 主旨大意題． 根據(jù)最后一段的"but many technical problems still must be cleared up on the way to this wonderful future"可知，在通往未來的路上，還有許多科技問題需要解決．故選C．

點評 本文是科技類閱讀理解．做這類題材閱讀理解時要求考生對文章通讀一遍，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)

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