题目

 Iraq has _______ too many wars since 1990s, making his people _______a lot. A. got through; suffer from       B. gone through; suffer C. looked through; suffering      D. passed through; suffered 答案：B关于原子结构的叙述正确的是A.所有的原子核都是由质子和中子组成的B.原子的最外层电子数不超过8个C.稀有气体原子的最外层电子数均为8D.原子的次外层电子数都是2