Jumping out of airplane at ten thousand feet is quite exciting experience.A. / theB. / a

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”