阅读下面短文，掌握其大意，然后从21—40各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
It was her giggling that drew my attention．Note taking really wasn't all that funny．
Walking over to the offender, I asked for the 21 ．Frozen, she refused to give it to me．I waited, all attention in the classroom on the quiet 22 between teacher and student．When she finally 23 it over she whispered, “Okay, but I didn't draw it．”
