— Can we eat much sugar?
— No, Too much sugar your teeth.
你看,它把黄色给了银杏树,黄黄的叶子像一把把____,扇哪扇哪,扇走了夏天的____。它把红色给了枫树,红红的枫叶像一枚枚____,飘哇飘哇,邮来了秋天的____。
地球的平均半径是( )
计算-nm2÷n2m3÷mn2的结果为( )