【简答题】Nearly half of the ______ (bore) audience had left the meeting before the closing address (闭幕词).
【单选题】To communicate with friends, nearly half of the college students use ______.
【判断题】物质与电磁辐射相互作用后,产生紫外一可见吸收光谱,这是由于分子的振动
【单选题】物质与电磁辐射相互作用后,产生紫外一可见吸收光谱,这是由于()。