得 分 评卷人 IⅡ.Comprehension(阅读理解，A0分) (-)Fill in the blanks with suitable words or expressions from the list given below,and change the form where necessary,.(从下面方框中选择合适的词或表达，以其适当的形式填空。 15分，每空3分) complex arithmetic/logic unit(ALU) add control unit heart The central processing unit (CPU)is the of the computer systems.It is the most computer system component,responsible for directing most of the computer system activities based on the instructions provided.The CPU comprises the _and the The control unit is responsible for directing and coordinating most of the computer systems activities.The ALU performs all the arithmetic and logical (comparison)functions that is,it subtracts, multiplies,divides,and does comparisons. Passage A Personal computer software is based on specific operating systems and machines.The famous PC operating systems are DO)S,Windows,OS/2,Unix,Linux,Mac OS. DOS (Disk Operating System)was the most popular operating system for IBM and IBM-compatible 16 bit personal computers.DOS is no longer widely used because it has a number of limitations. Microsoft built Windows as an extension of the widely installed DOS operating system. Windows provides not only a graphical user interface (GUI),but also memory management and multitasking capabilities. Unix is an interactive,multi-user,multitasking operating system that is highly supportive of communications and networking.At present,Unix is primarily used for workstations,minicomputers,and server computers in multi-user environments. Linux is the free Unix.It has all of the features you would expect of a modern,fully fledged Unix:true multitasking.virtual memory,shared libraries,demand loading,shared, 1432得 分 评卷人 11. Comprehension(阅读理解，40分) (一)F川 in the blanks with suitable words or expressions from the list given below，and change the form where necessary,(从下面方框中选择合适的词或表达，以其适当的形式填空。 5分 .每空 3分) complex control unit art山metic/logic unit(ALU) add heart The central processing unit (CPU) is the of the computer systems. It is t lie most _computer system component，responsible for directing most of the computer system activities based on the instructions provided. The CPU comprises the and the .The control unit is responsible for directing and coordinating most of the computer systems activities. The ALU performs all the arithmetic and logical(comparison) functions一 that is，it ，subtracts， multiplies，divides，and does comparisons. Passage A Personal computer software is based on specific operating systems and machines. The famous PC; operating systems are DOS，Windows，OS/2，Unix, Linux，Mac OS. DOS(Disk Operating System)was the most popular operating system for IBM and IBM-compatible 16 bit personal computers. DOS is no longer widely used because it has a number of limitations. Microsoft built Windows as an extension of the widely installed DOS operating system. Windows provides not only a graphical user interface (GUI)，but also memory management and multitasking capabilities. Unix is an interactive，multi一user， multitasking operating system that is highly supportive of communications and networking. At present，Unix is primarily used for workstations，minicomputers，and server computers in multi-user environments. Linux is the free Unix. 1t has all of the features you would expect of a modern，fully fledged Unix:true multitasking。virtual memory，shared libraries，demand loading，shared， 1432