Failure to face up to painful experience can be ________ form of stress itself, and can increase ________ possibility of illness.

A．the; /

B．a; a

C．a; the

D．/; the

男，35岁，因服止痛片数片后觉胃痛，今晨排柏油样便400ml来诊。既往无胃病史。首选的检查是（）

A.血清胃泌素测定

B.B型超声检查

C.X线胃肠钡餐

D.急诊胃镜检查

E.胃液分析