题目

Something seemed different that day when I entered Donna’s fourth-grade classroom. Each of the students was writing on a piece of paper,   41   things they couldn’t do. The activity aroused (引起) my   42  , so I decided to check with Donna to see what was going on. As I   43   her, I noticed that she too was busy writing. “I can’t get John’s mother to come for a teacher conference.” “I can’t persuade Alan to use words   44   fists (拳头).” I was at a total loss   45   students and teacher were focused on the negative rather than the more   46抛物线的焦点到双曲线的渐近线的距离是（ ）A. B. C. D.