题目

On the night of February 14th, 2011, all the Chinese _________ by Guo Mingyi, a very common worker who ________ more than 180 poor children since 1994. A．are moved, helpsB．moved, helpedC．were moved, has helpedD．moved, have been helped 答案：C解析:略已知一个正方形的周长是24厘米，在这个正方形里面画一个最大的圆，圆的周长是(　　)厘米．