We had a wonderful performance in the annual school sports meeting. Not only ___ in the coming relay race, but also we were the runner-up of the tug-of-war.

A．won we the champion

B．we won the champion

C．the champion we won

D．did we win the champion

肺泡与进行气体交换相适应的特点有：肺泡数量   ，肺泡外面包绕着丰富的            ，肺泡壁与毛细血管壁都很   ，是   层扁平的上皮细胞。