题目

What will people die of 100 years from now? If you think that is a simple question, you have not been paying attention to the revolution that is taking place in bio-technology(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 l已知函数，且，则          ．