问题补充:
Jumping out of airplane at ten thousand feet is quite exciting experience.
A. /, the
B. /, an
C. an. an
D. the, the
答案:
A. /, the
B. /, an
(答案→)C. an. an
D. the, the
解析:airplane 为可数名词,an airplane 表示泛指,而此处的experience表示“经历”,为可数名词,an exciting experience意为“一次刺激的经历”