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第二部分 阅读理解（共30小题；每小题2分，满分60分）        阅读下面短文，掌握其大意，然后从21~50各题所给的四个选项（A、B、C、D）中，选出最佳选项，并在答题卡上将该项涂黑。 Laptop computers are popular all over the world. People use them on trains and airplanes, in airports and hotels. These laptops connect people to their workplace. In the United States today, laptops also connect students to their classrooms. Westlake College in Virginia will start a laptop computer program that allows students to do schoolwork anywh