肾性尿崩症与中枢性尿崩症的主要区别是（）

A.多饮、多尿、烦渴

B.高渗性脱水

C.尿比重低，尿渗透压一般在50～200mmol/L

D.禁水试验尿比重升高不明显

E.加压素试验提高尿渗透压程度

Speaker A: Hi. Excuse me, ...um ... do you need any helpSpeaker B: ______

A．Yes, but are you sure you can help me

B．Oh, yes. Do you have tennis shoes

C．Well, I'd like one chicken burger and a cup of coke, please.

D．Oh, yes, I do. I've been walking around in circles. I can't seem to find the train station.