第9课《猫和老鼠》

1. once                     从前

  barn                      谷仓

  frolic                      嬉戏

2. fro                       向后

3. cow                      牛

  spy                       发现，看见

4. soft                       柔软的

   paw                      爪子

5. pearl                     珍珠般的

   bit                       咬

6. teeth                     牙齿

   slip                      滑落，下降