2. 外语
  3. Software (of computers), is also called computer programs, which refers to instructions that cause the hardware—the machines—to

Software (of computers), is also called computer programs, which refers to instructions that cause the hardware—the machines—to

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问题     Software (of computers), is also called computer programs, which refers to instructions that cause the hardware—the machines—to do work. Software as a whole can be divided into a number of categories based on the types of work done by【S1】______. The two primary software【S2】______are operating systems (system software), which control the workings of the computer, and application software, which addresses the multitude of tasks for which people use【S3】______. System software thus【S4】______such essential, but often invisible, chores as maintaining disk files and managing the screen, whereas application software performs word processing, database management, and the like. Two additional categories that are neither【S5】______nor application software, although they contain elements of both, are network software, which【S6】______groups of computers to communicate, and language software, which provides programmers with the tools they need to write programs. In addition to these task-based categories, several types of software are【S7】______based on their method of distribution. These【S8】______the sc-called canned programs or packaged software developed and sold primarily through retail outlets; freeware and public-domain software, which is made【S9】______without cost by its developer; shareware, which is【S10】______to freeware but usually carries a small fee for those who like the program; and the infamous vaporware, which is software that either does not reach the market or appears much later than promised.

A) described           B) categories          C) include           D) make  
E) programs            F) disk                G) DVD               H) handles
I) system              J) available           K) similar           L) able
M) computers           N) enables             O) like
【S5】
选项
答案I
解析 该句缺少一个名词成分用在“neither... nor...”的结构中与“应用系统”并列，在上文第三句话提到了主要的两个软件类型，包括系统软件和应用软件，所以选择I项system。
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大学英语四级

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