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【正文】 and the optical disk etc. What is the Computer and the Inter? Figure 14 Figure 15 Figure 16 Figure 17 What is the Computer and the Inter? Figure 18 Figure 19 Figure 110 What is the Computer and the Inter? Figure 111 Figure 112 Figure 113 What is the Computer and the Inter? The system unit is a container that houses most of the electronic ponents that make up the puter system. Inside the system unit, the major part is the system board (See Figure 114) that holds the microprocessor (mainly CPU), Memory (Random Access Memory amp。 Read Only Memory), and expansion slots with expansion cards. Other ponents include disk drives— the hard disk drive, the floppy disk drive and the optical disk drives— and power supply. Outside the system unit there is the floppy disk drive unit, the optical drive unit (See Figure 115), USB ports, microphone ports etc. What is the Computer and the Inter? * Input and output devices translate data and programs between languages that people can understand and that the puter can recognize and process. Secondary storage devices are designed to hold data and programs even after the power to the puter system is turned off. The important kinds of secondary media are floppy, hard, and optical disks. Optical disks are monly known as CDs (Compact Discs) and DVDs (Digital Versatile/Video Discs).Figure 116 Using cables and satellites, electronic works establish munications among puters throughout the world. The Inter is a worldwide work for countless connected puters to share information and make munications. (See Figure 116) * The World Wide Web or WWW is an Inter service that provides an easytouse multimedia interface to connect to the Inter and to access numerous resources available on the Inter. Users with their puters logged on to the Inter can share information with others, send Email, use instant message to chat with friends, conduct mercial transactions, etc. With a modem, an Inter connection and a browser, your PC is ready for you to surf the Inter and send Email. What is the Computer and the Inter? Notes: 1． “ Microputer hardware includes the system unit… and the optical disk etc. ” 本句中由破折號引導(dǎo)的 4個現(xiàn)在分詞短語分別作： the system unit, input devices, output devices, secondary storage devices的同位語，對其補充說明。 3． “ The World Wide Web or WWW is
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