Recently，I flew to Las Vegas to attend a meeting. As we were about to arrive，the pilot announced with apology that there would be a slight 2l       B efore setting down. High desert winds had   22   the airport to close all but one runway. He said that we would be   23    the city for a few minutes waiting to   24  . We were also told to remain in our seats meanwhile with our seat belts fastened  25   there might be a few bumps(颠簸)．We11，that few minutes turned into about four—five minutes，including a ride that would make a roller coaster(过山车)  26  by comparison.
The movement was so fierce that several passengers felt  27   and had to use
airsickness bags. As you might guess，that’s not good thing to have happen in
a(n) 28    space because it only 29    to increase the discomfort of the situation.
About twenty minutes into the adventure，the entire airplane became very 30 .
There was now a sense of anxiety and fear that could be 31   noticed．Every passenger simply held on for dear life …except one. A  32  was having a good time! With each bump of the33!he would let out a giggle(咯咯的笑)of delight As I observed this，I 34     that he didn’t know he was supposed to be afraid and worried about his    35 He neither thought about the past nor about the future Those are what we grown—ups have learned from  36   .He was 37  the ride  because had not yet been taught to fear it. Having  understood this，I took a deep breath and   38  back into my seat，pretending I was   39   on a roller coaster. I smiled for the rest of the flight. I even  40    to  giggle once or twice ,much to the chagrin(随恼)of the man sitting next to me holding the airsickness bag.
21. A. mistake       B . delay               C . change          D. wind
22. A. forced       B . warned             C . swept           D. reminded
23. A. watching      B . visiting            C. circling          D. crossing
24. A. arrive               B . enter             C . stop                 D . land
25. A. if           B . though             C . because          D. while
26. A. light         B . pale              C . easy                 D . quick
27. A. sick         B . nervous            C . angry           D. afraid
28. A. empty      B . narrow             C . secret            D. open
29. A. happens      B . continues         C. fails                  D . serves
30. A. quiet       B . hot               C .  dirty          D.  crowded
31. A. partly      B .  gradually              C . shortly             D . clearly
32. A. pilot      B . baby                  C . guard               D . man
33. A. seats       B .  passengers      C . flight               D . airplane
34. A. realized     B .  hoped         C . agreed          D. insisted
35. A. health       B . safety         C . joy               D . future
36. A. teachers    B . books           C . experience       D. practice
37. A. learning              B . taking             C . missing          D . enjoying
38. A. sat           B . lay            C . went          D . rode
39. A. nearly         B . finally             C . really          D . suddenly 
40. A. attempted    B. managed           C . wanted          D . decided