5、The human brain contains ten thousand million cells and each of these may have a thousand connections. Such enormous 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, in only 10 or 20 years perhaps, we will be able to assemble（装配）a machine as complex as the human brain, and if we can we will. It may then take us a long time to render（致使）it intelligent by loading in the right software or by altering（改变）the architecture but that two will happen.

I think it is certain that in decades, not centuries, machines of silicon will arise first to rival（媲美）and then exceed their human ancestors. Once they exceed us they will be capable of their own design. In a real sense they will be able to reproduce themselves. Silicon will have ended carbon's long control. And we will no longer be able to claim ourselves to be the finest intelligence in the known universe.

As the intelligence of robots increased to match that of humans and as their cost declines through economies of scale（规模经济）we may use them to expand our frontiers, first on earth through their ability to withstand environments, harmful to ourselves. Thus, deserts may bloom and the ocean beds 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 of millions of people, will be within our power.

 

68.In what way can we make a machine intelligent?

A.By making it work in such environments as deserts, oceans or space

B.By working hard for 10 or 20 years

C.By either programming it or changing its structure

D.By reproducing it

69.The word “carbon” stands for     .

A.intelligent robots                             B.a chemical element 

C.an organic substance                       D.human beings

70.A robot can be used to expand our frontiers when     .

A.its intelligence and cost are beyond question

B.it is able to bear the rough environment

C.it is made as complex as the human brain

D.its architecture is different from that of the present ones

71.It can be inferred from the passage that     .

A.after the installation of a great number of cells and connections, robots will be capable of self-reproduction

B.with the rapid development of technology, people have come to realize the possibility of making a machine with human-like ability

C.once we make a machine as complex as the human brain, it will possess intelligence.

D.robots will have control of the vast, man-made world in space