●A local area network(LAN)is the communication of a number of computers by (66) connecting to each one in a single location,usually a single floor of a building or all the computers in a small company.

●The standard (67) in C language contain many useful functions for input and output，string handling，mathematical computations，and system programming tasks.

●The OSI (68) model，sometimes also called ISO or 7 layers reference model for communication.has been developed by the International Standards Organization in early 1980's.

●If your diskette has been (69) ，the computer can not store any new information on it.

●A word processor enables you to create a (70) ，store it electronically on a disk，display it on a screen，modify it by entering commands and characters from the keyboard，and print it on a printer.

●A highlevel language is an artificial language with which we can write various (71) .