→｜早期操作系统（专利保护）TRS-DOS，ROM OS’s TI99-4 Commodore PET，64，和 VIC-20， 第一套IBM-PC 苹果电脑 Sinclair Micro和QX等 非Unix商业操作系统CPM操作系统 MP/M……〔12-24〕

  →｜操作系统（OperatingSystem，简称OS），是电子计算机系统中负责支撑应用程序运行环境以及用户操作环境的系统软件，同时也是计算机系统的核心与基石。它的职责常包括对硬件的直接监管、对各种计算资源（如内存、处理器时间等）的管理、以及提供诸如作业管理之类的…〔12-24〕

  →考研｜1. It doesnt follow that one should abandon a workable plan simply because of minor setbacks . So doing would quite frankly be foo…〔12-22〕

  →考研｜Study the following drawing carefully and write an essay in which you should 1) describe the drawing, 2) interpret its implication…〔12-21〕

  →考研｜手机用量 看图英语作文新时代生活的必备物：手机 Directions ：Study the following graph carefully and write an essay in which you should 1) analyze the grap…〔12-21〕

  →考研｜文明风尚：己所不欲 勿施于人 Directions ： ? Understanding is a drop of golden sun, is wellspring of life, and is a bridge between man and the so…〔12-21〕

  →考研｜大学生活：树立目标 长远规划 Directions: ? Study the following set of cartoons carefully and write an essay in which you should 1) describe the…〔12-21〕

  →考研｜长远全面看问题：站得高 看得远1) describe the drawing,?2) interpret its meaning, and3) point out its implications in our life.…〔12-21〕