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听力原文： You may remember that a few weeks ago we discussed the question of what photography is. Is it art or is it a method of reproducing images？ Docs photography belong in museums or just in our homes？ Today I want to talk about a person who tried to make his professional life an answer to such questions. Alfred Stieglitz went from the United States to Germany to study engineering. While he was over there he became interested in photography and began to experiment with his camera. He took pictures under conditions that most photographers considered too difficult. He took them at night, in the rain and of people and objects reflected in windows. When he returned to the United Stated he continued this revolutionary effort. Stieglitz was the first person to photograph skyscrapers, clouds and views from an airplane. What Stieglitz was trying to do in his photographs was what he tried to do throughout his life: make photography ail art. He thought that photography could be just as beautiful a form. of selfexpression as painting or drawing. For Stieglitz, his camera was his brush. While ninny photographers in the late 1800s and early 1900s thought of their work as a reproduction of identical images, Stieglitz saw his as creative art form. moment. In fact he never retouched his prints or made copies of thorn. If you are in this class today, I'm sure you'd say: Well, painters don't normally make extra copies of their paintings, do they？
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听力原文： Why do people smoke？ One reason is that people become dependent on cigarettes. The substance which people cannot resist in cigarettes is nicotine. When people smoke the nicotine goes directly into the blood stream and makes people feel relaxed. A smoker's body gets accustomed to the nicotine
and if he stops smoking he feels nervous. Many smokers try to stop smoking but because of their dependence on nicotine they feel so uncomfortable that they often find it too hard to stop.
Another reason is that people simply enjoy smoking and what it symbolizes. Having a cigarette for many people means taking a break. For some people smoking becomes part of certain social forms, for example, the cigarette after dinner. Many people enjoy smoking because it makes their hands busy.
Many people also like the taste of tar in cigarettes. However, it is the tar that causes cancer. While governments and health experts have tried to make people give up smoking entirely, cigarette manufacturers have to keep selling them by producing cigarettes with less tar. Many people in western countries have welcomed these cigarettes since they find it difficult to stop smoking but want to reduce the risk to their health.
Why do so many people become dependent on cigarettes？
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