Section C Directions: Read the following text and choose the most suitable heading from the list A-F for each paragraph. There is one extra heading which you do not need. (D) A. the future of computer-human relationship B. the programming system of the computer C. the reason of the complexity of the human brain D. the possibility of a real supercomputer E. the way for computers to kill humans F. the shortages of the computer compared with a human brain 76. ____________________ The difference between a human brain and a computer is more complicated than we can imagine. The large mammalian brain is the most complicated thing, for its size. Though the human brain only weighs three pounds, in that three pounds are ten billion neurons and a hundred billion cells. The many billions of cells are interconnected in such a vastly complicated network that we can’t begin to explore as yet. 77. ____________________ Even the most complicated computer man has yet built can’t compare with the brain.  Computer switches and processes number in the millions rather than in the billions. What’s more, the computer switch is just an on-off device, whereas the brain cell is itself possessed of a complex structure. 78. ____________________ It’s frequently said that computers solve problems only because they are “programmed” to do so. They can only do what men have them do, in which way it is like the human brain. We can also do what we are “programmed” to do. Our genes “program” us the instant the zygote (授精卵) is formed, and our potentialities are limited by that “program.” 79. ____________________ Surely, though, if a computer can be made complex enough, it can be as creative as people.  If it could be made as complex as a human brain, it could be the replacement of a human brain and do whatever a human brain can do. Then the real supercomputer comes along. 80. ____________________ In other words, once we pass a certain critical point, the computers will gain a dominating position and present a complexity explosion. In a very short time thereafter, computers may exist not only taking after the human brain, but far passing it. When the time comes, we might as well step aside and hand over all our work to them and really have them serve us.