题目

This hat is not comfortable and that one is too expensive, so I will ______ of them.   A. not buy both        B. buy none       C. buy either      D. buy neither 答案：D我市某中学组织学生进行“低碳生活”知识竞赛，为了了解本次竞赛的成绩，把学生成绩分成A、B、C、D、E五个等级，并绘制如图的统计图（不完整）统计成绩．若扇形的半径为2cm，则C等级所在的扇形的面积是    cm2．