With the nuclear crisis worsening in Iran,the world's attention is fixed again on________is called the

Middle East.[ ]

A．which  

B．it  

C．that  

D．what

抗SSA／RO抗体与下列哪种疾病不相关（）

A.干燥综合征

B.新生儿狼疮

C.先天性心脏传导阻滞

D.川崎病

E.系统性红斑狼疮