Computers are electronic machines for processing data. Data are pieces or items of informa

tion that have been properly【C1】______so that the machine can work【C2】______them. Processing means handling the material that has been presented to the machine in【C3】______ways as performing calculations, classifying in- formation, or【C4】______comparisons. A computer is made of millions of electronic【C5】______that can store the data or switch them through【C6】______circuits with different functions at【C7】______speeds.

In only a short time, computers have【C8】______changed the way in which many kinds of work are done.【C9】______, they have created whole new areas of work that did not exist【C10】______to their development. We have all heard of computers【C11】______the course of rockets, preparing bank statements,【C12】______elections, forecasting weather, and so【C13】______Computers do many tasks for us that would be【C14】______difficult if we did not have them. Computers take routine tasks and do them in a【C15】______of the time it would take a man or even a【C16】______of men to do them.

Many people imagine that a computer is a very large【C17】______machine. Certainly a computer can function in that way,【C18】______this is a very restricted view of the nature of a computer. The message of a familiar【C19】______is that machines should work, but men should think. This is the basic philosophy of computer science,【C20】______in the advanced states of computer technology.

【C1】

A．done

B．prepared

C．explored

D．investigated