The science of medicine,            progress has been very rapid lately, is perhaps the most important of all the sciences.

A．to which

B．in which

C．which

D．with which

在口腔内由于唾液的作用，能初步消化的物质是 [ ]

A．蛋白质

B．淀粉

C．麦芽糖

D．脂肪