必修1 unit 1 school life ⅰ.单项填空 1．jumping out of ________airplane at ten thousand feet is quite ________exciting experience. a．/；/ b．/；an c．an；an d．the；the 答案 c [an airplane泛指“任何一架飞机”；experience作“经历；体验”讲，是可数名词，其前应加冠词。] 2．—it’s five years since i worked here. —________？
