题目内容
A(75) infected computer may lose its data．
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Computers are electronic machines for processing data. Data are pieces or items of information that have been properly【B1】so that the machine can work【B2】them. Processing means handling the material that has been presented to the machine in【B3】ways as performing calculations, classifying information, or【B4】comparisons. A computer is made of millions of electronic【B5】that can store the data or switch them through【B6】circuits with different functions at【B7】speeds.
In only a short time, computers have【B8】changed the way in which many kinds of work are done.【B9】, they have created whole new areas of work that did not exist【B10】to their development. We have all heard of computers【B11】the course of rockets, preparing bank statements,【B12】elections, forecasting weather, and so【B13】Computers do many tasks for us that would be【B14】difficult if we did not have them. Computers take routine tasks and do them in a【B15】of the time it would take a man or even a【B16】of men to do them.
Many people imagine that a computer is a very large【B17】machine. Certainly a computer can function in that way,【B18】this is a very restricted view of the nature of a computer. The message of a familiar【B19】is that machines should work, but men should think. This is the basic philosophy of computer science,【B20】in the advanced states of computer technology.
【B1】
A．Three.B．Twenty-four.C．Two hundred.D．Eight.
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
As more people live closer together, and as they use machines to produce leisure, they find that their leisure, and even their working hours, becomes spoilt by a by-product of their machines namely, noise. Noise is nowadays in the news; it has acquired political status, and public opinion is demanding, more and more insistently, that something be done about it.
To control noise is to demand much self-discipline(annoyance arises often from lack of common courtesy), a sense of proportion(there is usually a conflict of interest if a noise is to be stopped), the expenditure of money(and it is far more economical to do this early rather than late), and finally, technical knowledge.
Technical difficulties often arise from the subjective-objective nature of the problem. You can define the excessive speed of a motorcar in terms of a pointer reading on a speedometer. But can you define excessive noise in the same way？ You find that with any existing simple "noisy-meter", vehicles, which are judged to be equally noisy, may show considerable difference on the meter.
Though the ideal cure for noise is to stop it at its source, this may in many cases be impossible. The next remedy is to absorb it on its way to the ear.
Domestic noises may perhaps be controlled by forethought and courtesy, and industrial noises by good planning and technical improvement. But if we are going to allow fast motorcycles and heavy lorries to pass continuously through residential and business districts, the community must decide on the control it needs to exercise, for in the long run it has got to pay for it. And if a nation is to take part in modern air transport, it must enter into international agreements on the noise control and here the cost of any real control is to be measured in millions of dollars.
According to the first paragraph, noise is______.
A．He needs to press F-7 to return to the document before be prints it.B．He has to prin
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