The human brain contains 10 thousand million cells，and each of these may have a thousand connections．Such large numbers used to discourage us and cause us to dismiss the possibility of making a machine with human-like ability，but now that we have grown used to moving forward at such a pace we can be less sure．Quite soon，maybe in only 10or 20years perhaps，we will be able to create a machine as complex as the human brain，and if we can we will．It may then take us a long time to make it intelligent by loading in the right software or by changing the architecture but that too will happen．As the intelligence of robots increases to rival that of humans and as their cost declines through economies of scale，we may use them to expand our frontiers（前沿），first on earth through their ability to remain unharmed in the environments which are harmful to us．Thus，deserts may bloom and the ocean beds may be mined．Further ahead，by a combination of the great wealth this new age will bring and the technology it will provide，the construction of a vast，man-created world in space，home to thousands or millions of people，will be within our power．28．In what way can we make a machine intelligent？ ____ A．By collecting its 10 thousand million cells．B．By working hard for 10 or 20 years．C．By properly programming it or changing its structure．D．By moving forward at a pace as fast as possible．29．The underlined word"rival"means" ____ "．A．confirm B．anchor C．betray D．match30．What does the writer think about machines with human-like ability？ ____ A．He believes they will be useful to human beings．B．He believes that they will control us in the future．C．He is not quite sure in what way they may influence us．D．He doesn't consider the construction of such machines possible．31．What can be the best title of the article？ ____ A．What is the future world like？B．Will future machines replace humans？C．Future intelligent machines for humansD．Future intelligent machines out of control．