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In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat. But this is not true. Cold simply means "having very little heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible.Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun"s heat that is trapped in things such as wood, coal and oil. And he has been able to use this heat.Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energy into mechanical energy. Engines can do the work of many men. Without engines industrial civilization is impossible.Yet when the first engines were built in the 17th century, men were still wondering about the nature of heat. "What is it" they asked. Not until the early years of the 19th century did they find the right answer. From the last two sentences, we can see （）
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In everyday usage "hot" means "having a lot of heat". Many people think that "cold" is something completely separated from heat. But this is not true. Cold simply means "having very little heat". Your life depends on heat. In fact, every living thing depends on it. Without heat, every living thing would be frozen to death. All living things get their heat from the sun, which provides the conditions in which life is possible.Since before the dawn of history, man has been able to make his own heat. He has been able to release the sun"s heat that is trapped in things such as wood, coal and oil. And he has been able to use this heat.Heat has made civilization possible. With heat, man could melt metals. As man learned to use metals and fuels, industries grew. As a result, engines were invented. These are machines that change heat energy into mechanical energy. Engines can do the work of many men. Without engines industrial civilization is impossible.Yet when the first engines were built in the 17th century, men were still wondering about the nature of heat. "What is it" they asked. Not until the early years of the 19th century did they find the right answer. He has been able to release the sun"s heat that is trapped in things such as wood, coal and oil. From this sentence we know （）
In order to work here the foreigner needs a work permit, which must be applied 1 by his prospective employer. The problem here is that the Department of the Employment has the right to 2 or refuse these permits, and there is little that can be 3 about it. It would be extremely unwise 4 a foreign visitor to work without a permit, since anyone doing so is 5 to immediate deportation. There are some 6 to this rule, most notably people from the Common Market countries, who are 7 to work without permits, and who are often given 8 residence permits of up to five years. Some 9 people, such as doctors, foreign journalists, 10 and others, can work without permits.The problem with the Act is not just that some of its rules are unfair but 11 it is administered, and the people who administer it.An immigration official has the power to stop a visitor 12 these shores coming into the country. If this happens the visitor has the 13 to appeal 14 the Immigration Appeal Tribunal. While the appeals are being considered, the visitor has no 15 but to wait sometimes for quite a long time.Critics of the law say that immigration officials treat the 16 visitors badly, and appear to accept or 17 them for no 18 reason. Which side of the political 19 you are on, there seems to be an urgent need for a good look at the Act, for it causes frequent argument, and in the eyes of many, real 20 . 1（）
Most people have had a dog or wanted one as their companion at some time in their lives. If you are thinking of buying a dog, however, you should first decide what sort of companion you need and whether the dog is likely to be happy in the surroundings you can provide. Specialists" advice is useful to help you choose the most suitable kind of dog. But in part the decision depends on common sense. Different dogs were originally developed to perform specific tasks. So, if you want a dog to protect you or your house, for example, you should choose the one that has the right size and characteristics. You must also be ready to devote a great deal of time to training the dog when it is young and give it the exercise it needs throughout its life, unless you live in the countryside and can let it run freely. Dogs are demanding pets. Cats love the house and so are satisfactory with their place where there is secure, but a dog is loyal to its master and consequently wants him to show proof of his affection.The best time to buy a baby dog is when it is between 6 and 8 weeks old so that it can transfer its love from its mother to its master. If baby dogs have not established a relationship with the human being until they are over three months old, their strong relationship will always be with dogs. They are likely to be too shy when they are brought out into the world to become good pets. Why does the writer say a dog is a more demanding pet than a cat（）
In order to work here the foreigner needs a work permit, which must be applied 1 by his prospective employer. The problem here is that the Department of the Employment has the right to 2 or refuse these permits, and there is little that can be 3 about it. It would be extremely unwise 4 a foreign visitor to work without a permit, since anyone doing so is 5 to immediate deportation. There are some 6 to this rule, most notably people from the Common Market countries, who are 7 to work without permits, and who are often given 8 residence permits of up to five years. Some 9 people, such as doctors, foreign journalists, 10 and others, can work without permits.The problem with the Act is not just that some of its rules are unfair but 11 it is administered, and the people who administer it.An immigration official has the power to stop a visitor 12 these shores coming into the country. If this happens the visitor has the 13 to appeal 14 the Immigration Appeal Tribunal. While the appeals are being considered, the visitor has no 15 but to wait sometimes for quite a long time.Critics of the law say that immigration officials treat the 16 visitors badly, and appear to accept or 17 them for no 18 reason. Which side of the political 19 you are on, there seems to be an urgent need for a good look at the Act, for it causes frequent argument, and in the eyes of many, real 20 . 15（）
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