题目

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 anywhere they want．Within five years, each of the 1500 students at the college will receive a laptop．The laptops are part of a ＄10 million computer program at Westlake, a 110-year-old college．The students with laptops will also have a17．下列描述正确的是（　　）A．氯水的标签上应标注：B．O2-的结构示意图：C．乙烯的结构简式：CH2CH2D．BeCl2的电子式：