My father is now in his late forty but he looks young for his age. He is very strict with me, especial in my studies. Besides, I know he loves me deeply in his heart. Once I had failed to do well in my math exam, I was afraid that it would make my father angry and disappointing. On contrary, he said I had tried my best and offered him a few words of encouragement. He told me that there is no need to feel bad about one and two failures and the most important thing is to learn anything from failure and never give up. Today is Father’s Day and I want to say thank you for my father.

继发性肾上腺皮质功能减退时（）。

A.血浆ACTH升高

B.血浆ACTH降低

C.血皮质醇升高

D.尿皮质醇升高

E.尿17-羟升高