1 mo1Cu₂S与2 mol FeO投入到足量稀硝酸溶液中，充分反应得到Fe(NO₃)₃、Cu(NO₃)₂、

CuSO₄的混合溶液，并产生NO气体。则最终反应所得NO物质的量为 (      )

A．4 mo1

B．5 mo1

C．6 mo1

D．7 mo1

Large quantities of water, as well as some other timely help including a medical team ___ since the serious drought hit Yunnan Province. [ ]

A. has offered                          

B. had been offered  

C. have been offered                      

D. is offered