2007年12月英语六级短文改错47

The human brain contains 10 thousand million cells and

each of these may have a thousand connections. So enormous ___1___

numbers used to discourage us and causing us to dismiss the ___2___

possibility of making a machine with human-like ability, but now

that we have grown used to move forward at such a pace we can ___3___

be less sure. Quite soon, in only 10 or 20 years perhaps, we will

be able to assemble a machine as complex as the human brain,

and if we can we will. It may then take us a long time to render

it intelligently by loading in the right software or by altering the ___4___

architecture but that too will happen. I think it certain that in

decades, no centuries, machines of silicon will arise first to rival ___5___

and then exceed their human ancestors. Once they exceed us

they will be capable of their own design. In real sense they will ___6___

be able to reproduce themselves. Silicon will have ended carbon’s