A.rivers and lakes | B.rain |
C.wells | D.A, B, and C |
A.get enough fresh water | B.think water is endless |
C.dig a well | D.use up water |
A.Fresh water. | B.Little rain. |
C.Pouring dirty water. | D.Money. |
A.Water will never be used up. |
B.How to find fresh water. |
C.Water is everywhere. |
D.Shortage(短缺)of fresh water. |