摘要:第一节.单项选择(共15题,每小题1分.满分15分) 从A.B.C.D四个选项中选出可以填入空白处的最佳选项.21. Jumping out of airplane at ten thousand feet is quite exciting experience. A. 不填; the B. 不填; an C. an; an D. the; the

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