双代号时标网络计划中，若波形线起点和终点所对应的时标值分别为3，7，则表示( )。

若复数(a²-3a+2)+(a-1)i是纯虚数，则实数a的值为（     ）

A．1

B．2

C．1或2

D．-1

“当然，物质和意识的对立，也只是在非常有限的范围内才有绝对的意义”。这里讲的“有限的围内”是指

A．物质能否为意识所正确反映

B．物质和意识是否相互作用

C．意识能否反作用于物质

D．物质第一性和意识第二性

为了使囱本身阻力（）烟囱直径不应太细，但也不能太大

A．较大

B．较小

C．为零

完型填空（共20小题；每小题 1.5 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。

In the United States there was an unusual tale telling of the daughter of a mechanic （技工）. One day while walking along the bank of a lake, the girl  36  to see 20 eggs laid by a wild goose. After some time the girl   37  the mother would not return to her eggs and she   38   to take them home. There she carefully   39  the eggs in the heat of a lamp. Several days   40   the eggs broke and the baby geese came into the   41 .

Geese are known to take the first living thing they see as their mother.   42  , to these young geese, the girl was their mother.

As they   43 , the girl was able to   44  her birds to run across the grass, but she could not teach them to   45  . The girl became increasingly worried about this, both when   46   and in her dreams. Later, she had an   47  : She would pilot a plane to guide them in   48  . She asked her father for a plane and he assembled（组装）a small aircraft for her.

Caring about  49  safety, the father decided to pilot the plane himself. However, the birds did not  50  or follow him, and   51  slept in the grass.

One day, the girl  52  into the plane, started it and soon left the   53 . Seeing their mother take to the air, the birds   54  flapped（拍打）their wings and  55  . She flew the plane freely in the sky, her young birds following.

36. A. managed           B. attempted            C. happened        D. supposed

37. A. realized            B. expected             C. imagined        D. admitted

38. A. helped             B. decided              C. afforded         D. meant

39. A. placed             B. protected             C. treated          D. examined

40. A. ago               B. out                  C. later            D. long

41. A. family             B. lake                 C. home           D. world

42. A. But               B. Also                 C. Thus            D. Still

43. A. increased          B. improved             C. rose             D. grew

44. A. ask               B. lead                  C. want            D. allow

45. A. fly               B. race                  C. swim            D. sing

46. A. asleep            B. away                  C. around          D. awake

47. A. idea              B. opinion                C. explanation      D. excuse

48. A. sky               B. heaven                C. flight           D. plane

49. A. his               B. her                   C. their           D. its

50. A. respect            B. remember              C. recognize       D. receive

51. A. so                B. instead                C. hardly          D. too

52. A. climbed           B. looked                 C. reached        D. fell

53. A. house             B. floor                  C. water           D. ground

54. A. secretly            B. disappointedly          C. patiently        D. eagerly

55. A. looked away     B. set out        C. went by        D. turned back

下列X线征象中，不是肺血增多的表现的是：()

A．肺血管纹理增多

B．肺动脉段凸出，两肺门动脉扩张，搏动增强

C．扩张的血管边缘清楚

D．肺野透明度正常

E．肺野内出现扭曲而紊乱的血管影