The book which is ________ 100 yuan is not worth ________.
A:cost; buying
B:worth; to be bought
C:worth; buying
D:paid; buying
据史书记载,西周初年有800个诸侯国,春秋初年还剩170多个,战国初期还有十几个诸侯国,到公元前221年,实现了“四海一”。这一历史现象反映了我国历史发展的什么趋势?
名著阅读:《水浒传》。