题目内容：

Recently，I flew to Las Vegas to attend a meeting. As we were about to arrive，the pilot announced（宣布） with apology that there would be a slight     before landing. High desert winds had     the airport to close all but one runway. He said that we would be      the city for a few minutes waiting to     . We were also told to remain in our seats meanwhile with our seat belts fastened    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)pale by     .

The movement was so sudden that several passengers felt    and had to use airsickness bags（晕机袋）. As you might guess，that’s not good thing to happen in a(n)          space because it only     to increase the discomfort of the situation.

About twenty minutes into the adventure，the entire airplane became very    . There was now a sense of worry and fear that could be    noticed．Every passenger simply held on for dear life …except one. A    was having a good time! With each bump of the    he would let out a giggle(咯咯的笑)of happiness. As I observed this, I    that he didn’t know he was supposed to be afraid and worried about his       He neither thought about the past nor about the future Those are what we grown-ups have learned from    . He was      the ride because he had not yet been taught to fear it. Having understood this, I took a deep breath and     back into my seat, pretending I was          on a roller coaster(过山车). I smiled for the rest of the flight. I even      to giggle once or twice , which is much to the anger of the man who was sitting next to me and holding the airsickness bag.

1.A. mistake    B. delay       C. change      D. wind

2.A. forced     B. warned      C. swept        D. reminded

3.A. watching   B. visiting     C. circling     D. crossing

4.A. arrive     B. enter      C. stop        D. land

5.A. if         B. though       C. because     D. while

6.A. experience B. comparison  C. adventure    D. challenge

7.A. sick      B. nervous     C. angry        D. afraid

8.A. empty      B. narrow       C. secret      D. open

9.A. serves      B. continues  C. fails        D. Happens

10.A. quiet      B. hot         C. dirty        D. crowded

11.A. partly      B. gradually    C. shortly    D. clearly

12.A. pilot     B. baby         C. guard       D. man

13.A. seats       B. passengers C. flight      D. airplane

14.A. realized  B. hoped       C. agreed       D. insisted

15.A. health      B. safety       C. joy        D. future

16.A. teachers    B. books      C. experience  D. practice

17.A. learning    B. taking       C. missing     D. enjoying

18.A. sat        B. lay         C. went       D. rode

19.A. nearly     B. finally    C. really       D. suddenly

20.A. attempted B. managed      C. wanted     D. decided