六年级英语阅读题 To Catch the Moon

 To Catch the Moon
  Little Sam:  Look ,Dad. There is a moon in the river. How bright it is!
Dad:       Yes. It’s beautiful .
Little Sam:  Give me a pail, and I will catch the moon.
Dad:       Oh, no. The moon is in the sky . Look! The river is like a big mirror. That is why you can see moon in it. 
Little Sam:  I see.

回答问题：
1. What can Sam see in the river?                                
2. Can he catch the moon?                                      
3. Why can’t Sam catch the moon in the river?