题目

Americans use many expressions with the word “dog”. People in the United States love their dogs and treat them well.    36   However, dogs without owners to care for them lead a different kind of life. The expression, to lead a dog's life, describes a person who has an unhappy existence. Some people say we live in a dog-eat-dog world.   37   They say that to be successful, a person has to work like a dog. This means they have to work very, very hard. Such hard work can make people dog-tired. And, the situation would be even worse if they became sick as a dog.   38   Th汉武帝为加强皇权，巩固国家统一而采取的措施有：①建立中朝　②设置刺史　③实行推恩令　④分封同姓诸侯王A．①②③B．①②④C．②③④D．①②③④