It’s very wise of you to ________ well trained workers _____ untrained ones in the

assembly line.

A．substitute; for

B．substitute; with

C．replace; with

D．instead; by

血液透析病人最常见的并发症是( )

A．腹膜炎
B．低血压
C．引流不畅
D．心衰
E．感染