白陶土便可见于

A．痔疮
B．消化道出血
C．阻塞性黄疸
D．阿米巴痢疾
E．过敏性肠炎

A: I’m not sure what Dr. Tyler wants us to do.
B:().

A. So you didn’t come to the class yesterday

B. I’ll make a call to him if you don’t mind.

C. Oh, you’d better guess it out by yourself.

D. If I were you, I’d write and ask Dr. Tyler to look at it.