Jumping out of _______ airplane at ten thousand feet is quite _______excitingexperience.
A.不填; theB.不填; anC.an; anD.the; the在线课程C
题干中设置两空。根据本句语义，第一空为“泛指”任意一架飞机(只要条件符合at ten thousand feet)，因此用不定冠词an airplane…第二空则需要考虑到后面名词experience在本句中的具体所指：Jumping out of…是指的一段“经历”(=something that happens toyou or something that you do， especially something important that affects you)。第二空也应选an。本题涉及冠词的基本用法以及与之相关的词汇知识运用。