现代科技英语unit5.ppt

现代科技英语教程 Unit 5 Text A Exercises;Mark the following statements with T (true) or F (false) according to the passage ( ) 1. The components of computer hardware are connected to CPU through wires or circuitry called a “bus”. ( ) 2. An optical scanner uses touch-sensitive equipment to convert images such as a picture or text into electronic signals that can be manipulated by a computer. ( ) 3. The function of both Dot-matrix printers and Laser printers is to take text and image from a computer and print them on paper. ( ) 4. Random access memory (RAM) is used to store the information and instructions permanently that operate the computers programs. ( ) 5. Floppy disks store much more information than a hard disk drive and retrieve the information at a much faster rate.;II. Give brief answers to the following questions 1. What is the function of these components of computer hardware typically divided into? 2. What devices does computer input hardware consist of? 3. Why is Random access memory (RAM) known as volatile memory? 4. Why is flash memory now very popular in portable devices? 5. What’s the main difference between input hardware and output hardware in function?;;III. Match the items listed in the following two columns;IV. Translate the following expressions 1. laser printers 2. local area network 3. nonvolatile memory 4. optical scanner 5. electronic circuitry 6. 调制解调器 7. 色带 8. 只读存储器 9. 数码影碟 10. 中央处理器;V. Translate the following sentences into Chinese 1. A joystick is a pointing device composed of a lever that moves in multiple directions to navigate a cursor or other graphical object on a computer screen. 2. A network interface card (NIC) allows the computer to access a local area network (LAN) through either a specialized cable similar to a telephone line or through a wireless (Wi-Fi) connection. ;3. Usually a permanent part of the computer, hard disk drives can store large amounts of information and retrieve that information very quickly.