题目

完形填空通读下面短文，掌握其大意，然后在各题所给的四个选项(A、B、C和D)中选出一个最佳选项。When I was in primary school, I had a big argument with a boy in my class. I can’t  1    what it was about, but I have never forgotten the   2   I learned that day.I was sure that I was right and he was wrong.   3  , he strongly believed that I was wrong and he was right. The teacher decided to teach us a lesson. She   4   a good idea. She brought both of us to the front of the class and placed him on one side of her grey desk and me on  5  . In已知双曲线分别位于第二、四象限，那么点P（a2，a-1）一定在第________象限．