题目

已知aAn+、bB(n+1)+、cCn-、dD(n+1)-均具有相同的电子层结构，关于A、B、C、D四种元素的叙述正确的是         （  ）   A．原子半径：A＞B＞C＞D          B．原子序数：b＞a＞c＞d C．离子半径：D＞C＞B＞A          D．金属性：B＞A，非金属性：D＞C 答案：  B ______what many people thought, the graduate came here not to ______ fame or money but the true value of life. A．On the contrary with; look for B．Contrary to; seek C．Opposite to; search D．To the contrary of; hunt for