GRE issue-孙远的工具箱-科技类.docVIP

No.1 孙远的工具箱（科技类） 有用的话，再传上来一些：）科技类1 计算机和教育Computers enhance a student’s learning experience in many ways. First of all, the computer has the ability to accommodate individual difference in learning speed because the user (the student) is the one who controls the pace of the lessons. In addition, the learner does not have to be afraid of reprisal or humiliation when making errors. A third advantage of computer assisted instruction is that a computer can give a student immediate feed back.Computer can make the teacher’s job easier. One advantage lies in the preparation of instructional materials. In addition, the computer offers numerous advantages to teachers in managing their classrooms. Finally, computer can help teachers keep student records and chart student progress, thereby cutting down on time-consuming paperwork..2. 计算机与工作环境In an atmosphere of computer monitoring, inept workstations, inflexible pacing, and nerve-wracking anxiety, workman’s compensation claims based on job stress have more than doubled since 1980, and now account for approximately 15 percent of all occupational disease claims. According to estimates by the OTA, stress-related illness costs business, between $50 and 75$ billion per year.3. 太阳能What’s making solar energy so hot? For one thing, the technology is getting better and cheaper. The price of the photovoltaic cells that convert sunlight to electricity has fallen sharply from $500 a watt in the 1960s to about $4 today. Companies are now rushing to break the $2 barrier. Texas Instruments and Southern California Edison have joined forces to produce flexible solar panels from inexpensive low-grade silicon. The innovative technology will allow the panels to be integrated into car and building design and, even more important, will crash the price to $2.50 a watt.4. 微型机器In the past, one of the biggest disadvantages of machines has been their inability to work on a micro (or tiny) scale. For example, doctors did not have devices a