.This printer is of high quality and very expensive. ________, we would buy __________.

A．Should the price of it be brought down; one

B．If the price of it be brought down; one

C．The price of it was brought down; it

D．Brought down; it

淀粉、蛋白质、脂肪的消化分别开始于[ ]

A．口腔、胃、小肠    

B．口腔、胃、胃  

C．胃、小肠、小肠    

D．胃、胃、小肠