| 1.Single program operating systems allow ( ) user(s) to run ( ) program(s) at one time. |
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| 2.The most important program on any computer is ( ). |
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| 3.The user must interact with the （ ） in order to accomplish task. |
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| 4.（ ） is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC. |
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| 5.Computer systems consist of two very different types of elements: Hardware, which includes all the physical things that can be touched and （ ） , which tells the hardware how to do . |
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| 6.Insufficient （ ） can cause a processor to work at 50% or even more below its performance potential. |
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| 7.( ) is a fast and powerful operating system, based on the UNIX O.S. |
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| 8.( ) is an operating system that was initially created as a hobby by a young student. |
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| 9.The（ ）is a collection of modules serving as interface between hardware and software to provide a software platform. |
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| 10.The two goals of an operation system are （ ） and efficiency. |
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| 11.As an operating system repeatedly allocates and frees storage space , many physically separated unused areas appear. This phenomenon is called （ ） . |
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| 12.( ) allow more than one program to be run at the same time on the computer. |
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| 13.A （ ） consists of the symbols,characters, and usage rules that permit people to communicate with computer. |
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| 14.（ ）：An error can be caused by attempting to divide by 0. |
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| 15.( ) drives can erase and store data. |
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| 16.To document your code can increse program （ ） and make program easier to maintain . |
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| 17.When a program has no syntax errors, the compiler finishes ( ) the program, the source code, and generates an object code file. |
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| 18.The ( ) turns the object file into an executable program. |
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| 19.Programs written in all other kinds of languages are translated into ( ) before they are performed. |
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| 20.Every valid character in a computer that uses even （ ） must always have an even number or 1 bits. |
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