— I’m sorry I can’t find the library book anywhere.

— So…I’m afraid you have to _________ it.

A．send for

B．thank for

C．pay for

D．wait for

脑脊液蛋白质定量试验，可分为比浊法和比色法两类，蛋白质沉淀剂多采用______，蛋白质染料应用较多的是_______。