It is exciting to imaging 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. 

　　68.According to the passage， human death is now mainly caused by .

　　A. diseases and aging                  B. accidents and war

　　C. accidents and aging                 D. heart disease and war

　　69.Humans may live longer in the future because .

　　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

　　70We can learn from the passage that .

　　A. human life will not last more than 120 years 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

　　第四节阅读填空（共5小题；每小题2分, 满分10分）

　　根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项, 并在答题卡上将该项涂黑。选项中有两项为多余选项。

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