“I think we need to pay more attention to the artistic and cultural work that goes on in every neighborhood in this city,” Ms Martin said. “We are part of _____ makes New York unique.”

A．what

B．that

C．which

D．it

客户信用评级中，违约概率的估计包括（）两个层面。

A．单一借款人的违约概率和某一信用等级所有借款人的违约概率

B．单一借款人的违约概率和该借款人所有债项的违约概率

C．某一信用等级所有借款人的违约概率和这些借款人所有债项的违约概率

D．单一借款人的违约频率和某一信用等级所有借款人的违约频率