19世纪六七十年代，领导德国完成统一大业的是（    ）

阅读下面这首古诗，回答以下两题。
                                                                                                            夏 意（苏舜钦）
                                                                                                           别院深深夏席清，
                                                                                                           石榴开遍透窗明。
                                                                                                           树阴满地日当午，
                                                                                                           梦觉流莺时一声。
                                                                                             注：别院，即正院旁侧的小院。