题目

与下列哪个值相等( )．A.B. C. D. 答案：【答案】A【解析】按照二进制转化为十进制的法则，二进制一次乘以2的次方，从0到最高位）最后求和即可．然后计算选项、、、的值．．．．．．故选：．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 comparisonThe 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. wind22. A. forced       B. warned     C. swept           D. reminded23. A. watching     B. visiting     C. circling          D. crossing24. A. arrive       B. enter        C. stop           D. land25. A. if           B. though      C. because         D. while26. A. light        B. pale         C. easy           D. quick27. A. sick         B. nervous     C. angry          D. afraid28. A. empty       B. narrow      C. secret          D. open29. A. happens      B. continues    C. fails           D. serves30. A. quiet        B. hot          C.  dirty         D.  crowded31. A. partly        B.  gradually   C. shortly         D. clearly32. A. pilot         B. baby        C.  guard         D.  man33. A. seats        B.  passengers    C. flight          D. airplane 34. A. realized      B.  hoped      C.  agreed        D.  insisted35. A. health       B. safety        C.joy             D. future36. A. teachers      B. books       C.  experience     D.  practice37. A. learning     B.  taking      C.  missing       D.  enjoying38. A. sat         B. lay          C. went            D. rode39. A. nearly      B.  finally      C.  really          D.  suddenly40. A. attempted    B.  managed     C.  wanted       D.  decided