Sustainable development is long-term ________which focuses on the environment and  ________ natural resources.

A．plan; preserve

B．plan; preserving

C．planning; preserving

D．planning ;preserve

下列各组词语中，有两个错别字的一项是(    )

A．证券担误狙击纷至沓来

B．扺掌跻身平添明察秋毫

C．隔阂缉毒广搏哙炙人口

D．晋级联袂罹难待价而沽