A．The underground oil resources have not been affected.
B．Most of the desert animals and plants have managed to survive.
C．The oil lakes soon dried up and stopped evaporating.
D．The underground water resources have not been polluted.

A．When people consider marriage an important part of their lives.
B．When the costs of getting a divorce become unaffordable.
C．When the current marriage law is modified.
D．When husband and wife understand each other better.