1、2013 年职称英语理工类 B 级概括大意试题及答案（1）1. Children enjoy shouting at a high wall and hearing the sound come back to them. These sounds are called echoes (回声). Echoes have given us a number of valuable tools.2. Echo sounding devices were early used in making maps of the ocean floor. Sounds or ultrasonic (超声的)
2、sounds make good tools for determining how deep the water is under ships. Sometimes echoes from ultrasonic distance finding devices were prevented from working by fish swimming past or by the presence of large objects. So ultrasonic devices have been replaced by other tools.3. Radar is now a familia
3、r tool. Like many others it was an unexpected discovery. It was first observed by two researchers， who were studying sound communication. They were sending signals from a station on one side of a river in Washington，D IC. to a vehicle across the river. They discovered that their signals were stopped
4、 by passing ships. They recognized the importance of this discovery at once.4. All this was of course just a start， from which our present radar has developed. The word “radar，“ in fact， gets its name from the term “radio detection (检测) and ranging.“ “Ranging“ is the term for detection of the distan
5、ce between an object and the radar set. Today， in our scientific age， it would be difficult to manage without radar.5. One of the many uses of radar is as a speed control device on highways. When a person in an automobile is driving faster than the speed limit， radar will show this clearly and the t
6、raffic police can take measures to stop him.6. A pilot cannot fly a plane by sight alone. Many conditions such as flying at night and landing in dense fog require the pilot to use radar. Human eyes are not very good at determining speeds of approaching objects， but radar can show the pilot how fast
7、nearby planes are moving.23 Paragraph 2 .24 Paragraph 3 .25 Paragraph 4 .26 Paragraph 5 .A Study of SoundB Highway PoliceC Working PrinciplesD Early Use of “Radar“E Useful ToolsF Discovery by Chance27 Echo-sounding devices were early used to .28 Ultrasonic device were used to .29 Police use radar on highways to .30 Radar helps pilots to .A detect nearby objectsB determine the depth of the ocean waterC decide how fast you driveD stop passing shipsE map the ocean floorF observe water flow【参考答案】 23. D 24. F 25. C 26. B 27. E 28. B 29. C 30. A推荐：2013 版职称英语理工类 B 级考试题库下载
