对肾动脉狭窄最有诊断价值的是（）

A.病史

B.体格检查

C.超声检查

D.肾动脉造影

E.螺旋CT血管造影

--- Have you got ______  ready for the sports meeting?

--- Not yet. We still have _____    to do.

A．anything; nothing

B．something; everything

C．everything; something

D．everything; nothing