单项选择题：操作系统内核与用户程序、应用程序之间的接口是（）。A．SHELL命令 B．图形界面

题型：单项选择题

第二节完形填空(共20小题；每小题l 5分，满分30分)

阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

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 before setting down. High desert winds had 22 the airport to close all but one runway. He said that we would be 23 L the city for a few minutes waiting t0 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

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操作系统内核与用户程序、应用程序之间的接口是（）。A．SHELL命令 B．图形界面

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