题目

 --Did you notice a girl in red come in?    --No, I didn’t, I __________a book. A. will read                          B. am reading                    C. was reading 答案：C已知Zn2+的4s轨道和4p轨道可以形成sp3型杂化轨道，那么[ZnCl4]2—的空间构型为 A．直线形         B．平面正方形            C．正四面体形            D．正八面体形