题目

有一半径为1m的圆形铁片，要从中剪出一个最大的圆心角为90°的扇形ABC,用来围成一个圆锥，该圆锥底面圆的半径是            答案： mWould you like to have supper with us? [　　] A．have noodles B．eat bread and milk C．come to evening meal D．help cook