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.

　　41．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

　　42．In the author's opinion, today's most important advance in technology lies in ________.

　　A．medicine

　　B．the Internet

　　C．brain cells

　　D．human organ

　　43．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

　　44．How long can humans live in the future according to the passage?

　　A．Over 100 years.

　　B．More than 120 years.

　　C．About 150 years.

　　D．The passage doesn't tell us.

　　45．We can learn from the passage that ________.

　　A．human life will not last more than 120 years in the future

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