下列违背价值规律的是[ ]

A．钻石的稀缺程度比水高，因而钻石比水贵

B．古代少数民族用毛皮与汉族交换等价值的大米

C．甲用一块砖头充当秦代文物，换走乙一块黄金

D．制造火箭的成本比汽车高，因而火箭比汽车贵

China stands ready to join hands with all other countries to _________ the serious problems resulting from the energy crisis and build an even better future for the generations to come.

A．tend to

B．cut off

C．hold back

D．deal with