The National Day Parade for the 60th anniversary of the founding of China is so grand that it certainly doesn't _____ the whole nation．

A．let down

B．calm down

C．break down

D．set down

下列各项检查中，用来鉴别Cushing病和肾上腺皮质癌较可信的是（）

A.血皮质醇测定

B.尿游离皮质醇测定

C.尿17-羟测定

D.小剂量地塞米松抑制试验

E.大剂量地塞米松抑制试验