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8. (A) use (B) to use (C) using (D) being used
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B
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B
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1.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)1.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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3. The brand (商标) name puts a face on every company. Names like McDonald's, GM, Apple, Intel, and a large number of others have long become very popular. They've also given customers a point of reference when thinking about a company. Good brand names might help companies avoid heavy costs and bring them greater profits.Usually companies create names that are easy to learn and remember. Firstly, the name should create interest. Rhymes (押韵) and humor are some ways to gain interest, but there are others as well. Think about your customers and what would interest them. Secondly, the name should present a picture or image. People remember them most because the name is stored in pictures and words. Thirdly, the name should be meaningful. It can be done with lots of advertising, but names that are themselves more meaningful to customers are more easily stored in memory. More important, the name should have meaningful associations that show the benefits customers want. Then the name should have some emotion. Emotional associations are easier to learn and remember. The Love Boat, for instance, is very easy to remember. Finally, the name should be simple so that it is easier to learn and remember.31. Why does the passage mention the brand names such as McDonald's and GM in the first paragraph?____ A. To show that a good brand name is significant for a company. B. To tell readers that they are important and popular terms.C. To introduce some well-known brand names to readers.D. To explain why those companies are successful.
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