— Could you show me _______?

— Sure.

A．what can I do with the bike

B．how I could do with the bike

C．which was the way to the zoo

D．where he lives

呼吸衰竭时，临床上最早出现的症状是（）

A.呼吸困难

B.发绀

C.消化道出血

D.血尿

E.心悸