A.wasted land used to be wetlands |
B.people didn’t know the importance of wetlands before |
C.wetlands used to be left undisturbed |
D.wetlands can be used for building |
A.They absorb extra water from storms. |
B.They become large or small in size. |
C.They absorb pollutants and dissolve them. |
D.They are made of soft soil. |
A.Two. | B.Three. | C.Four. | D.Five. |
A.the threat to wetlands |
B.the protection of wetlands |
C.the development of wetlands |
D.the importance of wetlands |
A.some wetlands can be used to build cities or towns |
B.wetlands in the world are disappearing fast |
C.wetlands play an important role in the ecosystem |
D.wetlands are especially important to wildlife |