单选题
Data processing is a series of operations carried out on dam to get information. (67) series of operations is also called the data processing cycle. Data (68) a Stoup of facts called the input. The data may be numbers, letters, or symbols (69) may or may not be related. The information is the end result or the (70) .Information is data that have been processed. It is (71) a brief, usable form. The operations are (72) with different tools. A computer is (73) kind of data processing tool. The brain is (74) a data processing tool. The brain is like a small, personal computer that controls all bodily and mental (75) . Data, or input, enter the brain through the (76) (sight, smell, touch, taste, and hearing). The data are (77) by the brain, and the result is information. The information or output may cause physical and mental reactions (78) body movement, decisions, or ideas. How does the brain tell an apple (79) an orange? If the brain could not process data, this would not be possible. Apples and oranges differ (80) looks, feel, smell, and taste. The brain can tell these differences. The (81) in input help the brain to decide which is the apple and (82) is the orange. There are three levels of processing data. (83) level uses different tools. Some levels require less human effort than others. The three (84) are manual data processing, electro-mechanical data processing and electronic data processing. In manual data processing, the brain, hands, and simple tools such as pencil and paper (85) . Electromechanical data processing use electrically operated machines. (86) of the types of machines which are used are desk calculators and typewriters, electronic data processing uses electronic computer that processes data at a very high speed.