题目

Lisa, could you tell me ________ yesterday? A. what did the teacher say   B. what the teacher said C. what will the teacher say   D. what the teacher will say 答案：B根据如图信息，下列说法正确的是 ( )A. 镁属于非金属元素B. 镁原子的相对原子质量为24.31gC. 镁原子的核电荷数为12D. 在化学反应中，镁原子容易得到电子形成Mg2+