根据下面资料，回答21-30题
  What would happen if the human brain was connected to a powerful computer? That is what Kevin Warwick, a professor at the University of Reading, U. K.,  31  to find out. “I want to have a go at completely changing  32  it means to be human,” he says.
  Soon he will have an  33 . A glass tube will be placed around a group of nerves in his arm. Inside the tube there will be tiny computer circuits(线路). These circuits will  34  messages sent to the brain and send them to a computer.
  ”Pain produces an electronic signal on the nervous system and the signal is  35  to the brain. We want to find out what will happen if that signal is sent to the computer and then sent to the brain by the computer. Will I feel the  36  pain?” says Kevin Warwick.
  It is not just about the  37 . The human nervous system sends a wide variety of other messages to the brain,  38  there could be many different applications. The computer could provide eyes for a blind person. Anxious or depressed people are often given drugs to make them feel  39  But what if they could download feelings of happiness directly into their minds? Imagine you are thousands of miles away  40  your loved ones. You love them and long to be back with them. Then you store these feelings in a computer and send them to your family by e-mail.