小明要制作一个圆锥模型，其侧面是由一个半径为9cm，圆心角为240°的扇形纸板制成的，还需要一块圆形纸板做底面，那么这块圆形纸板的半径为____ cm．
默写古诗
绝句
两个黄鹂____，____白鹭____。
____，____。
He climbed so fast that he reached ______ floor in two minutes.
It was snowing hard_______we had to stay at home and watch TV.
