2012年職稱英語題庫：概括大意
新聞記者下面這篇短文後有2項測試任務：(1)第23～26題要求從所給的6個選取項中為第2～5段選擇1個正確的小標題;(2)第27～30題材要求從所給的6個選項中選擇4個正確選項，分別完成每個句子。請將答案塗在答題卡相應的`位置上。
1. Children enjoy shouting at a high wall and hearing the sound come back to them. These sounds are called echoes (回聲). 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 (超聲的) 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 So ultrasonic devices have been replaced by other tools.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 familiar 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 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 (檢測) and ranging." "Ranging" is the term for detection of the distance 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 traffic 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 nearby planes are moving.
更多資訊：職稱英語：閱讀理解容易得分嗎 2012職稱英語綜合類A級之補全短文