Read and write. 你能根据汉语提示，找出藏在字母串里的单词吗？   

1. scatoa (猫)                               

2. fbdogfge (狗)                               

3. lfjkducko (鸭子)                                

4. margoatbe (山羊)                                

5. jopsheepal (绵羊)                              

人类受到的人工辐射源的照射中，医疗照射位居首位。