—Do you like your new diet?

—Yes, I do. ______ I don't eat them any more. [ ]

A. So

B. And

C. But

D. Because

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