人教版高中英語必修2教案Unit 3 Computer

load - get data from a disk nibble - half a byte save - put data on a disk ram – random-access memory(隨機存取存儲器), the more the better. usb - universal serial bus（通用串行總線，一種簡化了插接多種附件的薄型插座） www - world wide web, part of the internet ii. pre-reading 1. questioning and answering‑‑‑what do you know about computer? ●electronic machine capable of performing calculations and other manipulations of various types of data, under the control of a stored set of instructions. the machine itself is the hardware; the instructions are the program or software. depending upon size, computers are called mainframes, minicomputers, and microcomputers. microcomputers include desk-top and portable personal computers. ●a multi-function electronic device that can execute instructions to perform a task. ●a device that accepts information, processes it, and supplies an output. a computer usually contains memory, a control unit, arithmetic and logical units, and a means for input and output. ●a programmable hardware component that is controlled by internally stored programs and that can perform substantial computations (including arithmetic and logic operations) without human intervention. a computer typically consists of one or more processing units, memory units, and associated peripheral input and output devices. ●related to automation and electronic data processing. the library of congress commonly classes most computer-related books in hf5548, qa75-76, z52, t385, and some tk ranges. ●a machine for performing calculations automatically calculator: an expert at calculation (or at operating calculating machines) ●a computer is a device or machine for making calculations or controlling operations that are expressible in numerical or logical terms. computers are constructed from components that perform simple well-defined functions. the complex interactions of these components endow computers with the ability to process information. if correctly configured (usually by, programming) a computer can be made to represent some aspect of a problem or part of a system. if a computer configured in this way is give 2. discussing and sharing‑‑‑how have computers changed our lives? someday soon, if you haven’t already, you’re likely to plug into the computer network nation growing in our midst. computer terminals, or small computers connected via modem (a modulator/demodulator circuit for encoding/decoding computer chatter) to ordinary telephone lines, should be as ubiquitous as the telephone itself. they’re a much more useful and humane tool than the phone, and with corporate america behind them the networks will be everywhere----changing our lives more than any technology since the automobile.