题目

下列现象中所发生的现象与电子的跃迁无关的是（ ） A．燃放焰火B．霓虹灯广告C．燃烧蜡烛D．平面镜成像 答案：考点：原子核外电子的跃迁及应用． 分析：光是电子释放能量的重要形成，霓虹灯广告、燃烧蜡烛、节日里燃放的焰火都与电子发生跃迁释放能量有关，以此来解答． 解答：解：平面镜成像则是光线反射的结果，与电子跃迁无关，而霓虹灯广告、燃烧蜡烛、节日里燃放的焰火是原子的发射光谱，与原In many parts of the world, farmers and their families live in villages or towns. In the United States, each farm family lives in its own fields. Usually their neighbors live far away. It's hard for them to see each other on weekdays. Their children take school buses to the nearest school. These school are only for the farm families in this area. In some areas, there are small school for a few farm families, and the children can walk to school and often go home for meals.In Australia it is very different. Farmers live close to each other and their children can walk to school and often go home for meals.Life keeps changing for everyone. Farmers keeps changing,too. Today there are cars, good roads, radios, television sets and there are modern machines for farming. All of them are changing farm life.【1】American farmers are the same as Australia farmers.【2】In Australia,each farm family lives far away from their neighbors.【3】In the USA, it’s hard for the farmers to see each other on weekdays.【4】Children of Australian farmers go to school by bus.【5】Farm life keeps changing and farmers keep changing.