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听力原文：W: What do you usually do on Sunday？
M: I go to church in the morning, work in the garden in
What does he usually do on Sunday evening？
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How is communication actually achieved.'？ It depends, of course, either on a common language or on known conventions, or at least on the beginnings of these. If the common language and the convention exist, the contributor, for example, the creative artist, the performer, or the reporter, tries to use them as well as he can. But often, especially with original artists and thinkers, the problem is in one way that of creating a language, or creating a convention, or at least, of developing the language and convention to the point where they are capable of bearing his precise meaning. In literature, in music, in the visual arts, in the sciences, in social thinking, in philosophy, this kind of development has occurred again and again. It often takes a long time to get through, and for many people it will remain difficult. But we need never think that it is impossible~ creative energy is much more powerful than we sometimes suppose. While a man is engaged in this struggle to say new things in new ways, he is usually more than ever concentrated on the actual work, and not on its possible audience. Many artists and scientists share this fundamental unconcern about the ways in which their work will be received. They may be glad if it is understood and appreciated, hurt if it is not, but while the work is being done there can be no argument. The thing has to come out as the man himself sees it.
In this sense it is true that it is the duty of society to create conditions in which such men can live. For whatever the value of any individual contribution, the general body of work is of immense value to everyone. But of course things are not so formal, in reality. There is not society on the one hand and these individuals on the other. In ordinary living, and in his work, the contributor shares in the life of his society, which often affects him both in minor ways and in ways sometimes so deep that he is not even aware of them. His ability to make his work public depends on the actual communication system: the language itself, or certain visual or musical or scientific conventions, and the institutions through which the conmunication will be passed. The effect of these on his actual work can be almost infinitely variable. For it is not only a communication system outside him; it is also, however original he may be, a communication system which is in fact part of himself. Many contributors make active use of this kind of internal communication system. It is to themselves, in a way, that they first show their conceptions, play their music and present their arguments. Not only as a way of getting these clear, in the process of almost endless testing that active composition involves. But also, whether consciously or not, as a way of putting the experience into a communicable form. If one mind has grasped it, then it may be open to other minds.
In this deep sense, the society is in some ways already present in the act of composition. This is always very difficult to understand, but often, when we have the advantage of looking back at a period, we can see, even if we cannot explain, how this was so. We can see how much even highly original individuals had in common, in their actual work, and in what is called their "structure of feeling", with other individual workers of the time, and with the society of that time to which they belonged. The historian is also continually struck by the fact that men of this kind felt isolated at the very time when in reality they were beginning to get through. This can also be noticed in our own time, when some of the most deeply influential men feel isolated and even rejected. The' society and the communication are there, but it is difficult to recognize them, difficult to be sure.
Creative artists and thinkers achieve communication by ______.
听力原文：W: Excuse me. Could you tell me the way to King's College, please？
M: Yes, walk straight up this road till you come to the traffic lights. The college is around the comer. You won't miss it.
What does the woman want to know？
W: Oh it wasn't that. Hill made a big mistake in last month's accounting. Even if it wasn't really his fault, his boss was very angry.
Why did Hill lose his job？
The need for solar electricity is clear. It is safe, ecologically sound, efficient, continuously available, and it has no moving parts. The basic problem with the use of solar photo-voltaic devices is economic, but until recently very little progress has been made toward the development of low-cost photo-voltaic devices. The larger part of the research funding has been devoted to study of single-crystal silicon solar cells, despite the evidence, including that of the leading manufacturers of crystalline silicon, that the technique holds little promise. The reason for this pattern is understandable and historical. Crystalline silicon is the active element in the very successful semiconductor industry, and virtually all of the solid state devices contain silicon transistors and diodes. Crystalline silicon, however, is particularly unsuitable to terrestrial solar cells.
Crystalline silicon solar cells work well and are successfully used in the space program, where cost is not an issue. While single-crystal silicon had been proven in extraterrestrial use with efficiencies as high as 18 per- cent, and other more expensive and scarce materials such as gallium arsenide can have even higher efficiencies, costs must be reduced by a factor of more than 100 to make them practical for commercial use. Besides the fact that the starting crystalline silicon is expensive, 95 percent of it is wasted and does not appear in the final de- vice. Recently, there have been some imaginative attempts to make polycrystalline and ribbon silicon, which are lower in cost than high-quality single-crystals; but to date the efficiencies of these apparently lower-cost arrays have been unacceptably small. Moreover, these materials are cheaper only because of the introduction of disordering in crystalline semiconductors, and disorder degrades the efficiencies of crystalline solar cells.
This dilemma can be avoided by preparing completely disordered or amorphous materials. Amorphous materials have disordered atomic structure as compared to crystalline materials: that is, they have only short-range order rather than the long-range periodicity of crystals. The advantages of amorphous solar cells are impressive. Whereas crystals can be grown as wafers about four inches in diameter, amorphous materials can be grown over large areas in a single process. Whereas crystalline silicon must be made 200 micron of the proper amorphous materials in necessary. Crystalline silicon solar cells cost in excess of $ 100 per square foot, but amorphous films can be created at a cost of about 50 cents per square foot.
Although many scientists were aware of the very low cost of amorphous solar cells, they felt that they could never be manufactured with the efficiencies necessary to contribute significantly to the demand for electric power. This was based on a misconception about the feature which determines efficiency. For example, it is not the conductivity of the material in the dark which is relevant, but only the photo-conductivity, that is, the conductivity in the presence of sunlight.
Already, solar cells with efficiencies well above 6 percent have been developed using amorphous materials, and further research will doubtlessly find even less costly amorphous materials with higher efficiencies.
The author is primarily concerned with ______.
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