●A （71） is a functional unit that interprets and carries out instructions.
（71） A. memory B. processor C. storage D. network

●A （72） consists of the symbols, characters, and usage rules that permit people to communicate

●A （71） is a functional unit that interprets and carries out instructions.
（71） A. memory             B. processor          C. storage           D. network
 
●A （72） consists of the symbols, characters, and usage rules that permit people to communicate with computer.
（72）A. programming language          B. network           C. keyboard            D. display
 
●  （73） software, also called end-user program, includes database programs, word processors, spreadsheets etc.
（73）A. Application          B. System          C. Compiler            D. Utility
 
●In （74） , the only element that can be deleted or removed is the one that was inserted most recently.
（74）A. a line          B. a queue         C. an array        D. a stack
 
●Most （75） measures involve data encryption and password.
（75）A. security        B. hardware           C. display           D. program