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听力原文： As a tradition, workers in companies are always required to wear suits and fie, but according to a senior government official, Thailand is to ask workers to stop wearing suits as part of the country ' s latest measure to conserve energy. This is the idea of the new government, because Thailand is a tropical country and air-conditioners have been used very commonly, which consume a large amount of energy, but if the workers turned up in shirt sleeves, they wouldn't need air-conditioners turned up so high. At its weekly meeting, the cabinet passed a resolution asking all public servants not to wear jackets and urging private employees to do the same. This has already been practised by the government. At a re cent meeting, only four of six air-conditioners in the cabinet room had been turned on. One of the government officials says, "Initially it was not hot in the room, but if a meeting lasts a long time, the temperature might need to be lowered a bit."
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Premises that are related to each other seems to be dispensable because ______ .
A scientist is apt to think that all the problems of philosophy will ultimately be solved by science. I think this is true for a great many of the questions on which philosophers still argue. For example, Plato thought that when we saw something, one ray of light came to it from the sun, and another from our eyes and that seeing was something like feeling with a stick. We now know that the light comes from the sun, and is reflected into our eyes. We don' t know in much detail how the changes in our eyes give rise to sensation. But there is every reason to think that as we learn more about the physiology of the brain, we shall do so, and that the great philosophical problems about knowledge are going to be pretty fully cleared up.
But if our descendants know the answers to these questions and others that perplex ns today, there will still be one field of which they do not know, namely the future. However exact our science, we cannot know it ns we know the past. Philosophy may be described as argument about things of which we are ignorant. And where science gives us a hope of knowledge it is often reasonable to suspend judgment. That is one reason why Marx and Engels quite rightly wrote to many philosophical problems that interested their contemporaries.
But we have got to prepare for the future, and we cannot do so rationally without some philosophy. Some people say we have only got to do the duties revealed in the past and laid down by religion, and god will look after the future. Other say that the world is a machine and the course of future events is certain, whatever efforts we may make. Marxists say that the future depends on ourselves, even though we are part of the historical process. This philosophical view certainly does inspire people to very great achievements. Whether it is true or not, it is powerful guide to action.
We need a philosophy, then, to help us to tackle the future. Agnosticism easily becomes an excuse for laziness and conservatism. Whether we adopt Marxism or any other philosophy, we cannot understand it with-out knowing something of how it developed. That is why knowledge of the history of philosophy is important to Marxists, even during the present critical days.
What is the main idea of this passage？
What field can our descendants NOT know？
This passage is mainly about ______ .
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