→｜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〕

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  →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〕

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  →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〕