单选题 What kind of social form immediately followed the Roman Republic Age?

【正确答案】 D
【答案解析】[解析] 文中第一段中提到：“The motto'S．P．Q．R’……remained the watch word of Roman society until Imperial Age．”可见，罗马共和国结束后，被罗马帝国所取代。答案应选 [D]。