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

问题补充：

Jumping out of airplane at ten thousand feet is quite exciting experience.

A. /; /

B. /; an

C. an; an

D. the; the

答案：

A. /; /

B. /; an

(答案→)C. an; an

D. the; the

解析：本题考查冠词。airplane和experience都是可数名词，表示泛指，前要加不定冠词。句意：从一万英尺高的飞机里跳出来是一次令人激动的经历。