题目

They seemed to have a perfect marriage but the (事实) was very different. 答案：【1】reality 秦国成为战国七雄中实力最强的封建国家，主要原因是 [　　] A． “连横”策略的实施 B． 铁制农具和牛耕的推广 C． 实行商鞅变法 D． 重视水利工程建设