【简答题】光导体在静电复印机中的作用是什么?常见的光导体材料有哪些?
【单选题】You should make notes listening carefully.
【单选题】Listening carefully to what people say helps _______ understand others more easily.
【单选题】.All the students were listening carefully, with their eyes _____on the teacher.
【多选题】以下哪项用地可以不用缴纳城镇土地使用税。