A man once had a dream about the Black Forest in Germany. In his dream he was walking in the forest when two men ran out and tried to throw him to the ground. He ran off as fast as he could,but they followed him. He reached a place where he saw two road in front of him,one to the right and the other to the left. Which road should he take?He heard the two men behind him, getting nearer, and at the same time he heard a voice in his ear. It told him to go to the right,and he did so. He ran on and soon came to a small hotel. He was received there kindly and given a room,and he was saved from the two men. That was the dream.
   Twenty years later he was really in the Black Forest and , as happened in the dream long ago, two men ran out and tried to throw him down. He ran off, and came to a place with two roads, like in the dreams. He remembered the dream and took the road to the right. He soon reached a small hotel , was taken in, and so was safe. His dream of twenty years before had saved his life.

赵久富是余嘴村的村支书,是移民搬迁的第一责任人,他原本属于内安范围,面对没有村民愿意外迁的局面,必须有人站出来打破僵局。有着30年党龄的老赵做出了人生最重要的一个决定,放弃内安,带头外迁黄冈。赵久富这样做(    ) 　

①说明要想实现人生价值,就必须放弃个人利益

②表现了对祖国、对人民的高度责任感

③以实际行动践行了“三个代表”重要思想

④是践行社会主义核心价值观的具体体现

与例句写法相同的一项是（      ）

例句：当小姑娘再拿水罐时，木头做的水罐竟变成了银的。

在根式：①$\sqrt{a^2+b^2}$，②$\sqrt{\frac{x}{5}}$，③$\sqrt{x^2-xy}$，④$\sqrt{27abc}$中，最简二次根式是（   　）