--- What color is your coat?

--- It’s          orange. It’s           orange coat.

A．an,/

B．/, an

C．a, an

D．an, an

下列哪项不是类风湿性关节炎的病因

A．先天不足，肾精亏虚

B．外感寒湿，痹阻经络

C．风寒湿邪，郁而化热

D．劳累太过，损伤肝肾

E．湿热伤阴，阴虚血热