题目

Down-to-earth means being honest, open, and easy to deal with. It is a pleasure to find someone who is down-to-earth. A person who is down-to-earth is easy to talk to. He or she accepts others as equals. A down-to-earth person may be an important member of society, of course, but they do not let their importance go to their heads, and they do not consider themselves to be better than others who are less important. Someone who is filled with self-importance and pride, often without cause, is said to have his nose in the air. There is no way a person with his nose in the air can be down-to-earth史载：“武王克商，先有天下，其兄弟之国十有五人，姬姓之国四十人”。封武王弟康叔于卫，封成王弟叔虞于晋，封周公子伯禽于鲁，封王室召公奭于燕（当时山东、山西是主要农业区）。由此可见                       （    ）        ①同姓亲族是分封的主体                         ②亲族封地富庶，战略位置重要        ③分封奠定了武王灭商的基础                  ④宗法制与分封制互为表里        A．①②③               B．②③④                C．①②③④            D．①②④