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

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：第一空泛指“一架飞机”用an；第二空指“一种经历”。用不定冠词an。故选C。句意：从1万英尺的高空的飞机上跳下来是非常令人兴奋的一种经历。