男性，15岁。反复呕血、黑便，皮肤淤斑1周，肝脾不大、血红蛋白60g／L，WBC6×

将一颗骰子投掷两次，第一次出现的点数记为a，第二次出现的点数记为b，设两条直线l₁：ax+by=2，l₂：x+2y=2平行的概率为P₁，相交的概率为P₂，则复数P₁+P₂i所对应的点P与直线l₂：x+2y=2的位置关系（　　）

A．P在直线l₂的右下方

B．P在直线l₂的右上方

C．P在直线l₂上

D．P在直线l₂的左下方

阅读下面短文, 掌握其大意，然后从36~55各题所给的四个选项（A、B、C和D）中，选出最佳选项。

One day before Christmas, all of us children from the Children's Home Society Orphanage(孤儿院) were taken to the Mayflower Hotel in downtown to attend a Christmas party.

After the man on the stage said a prayer      （祈祷）, we were told to 　36　 . Within minutes we were   37   a meal which was fit for a king. I ate   38 I could eat no more. As we ate, Santa Clause came walking out onto the  39 . The kids cheered with  40 . Everyone began clapping their hands and yelling as   41 as they could.

I too was excited   42  but I knew better than to yell（叫喊）out loud or to jump up and scream. Mrs. Winters, the head matron, sat only three seats from me. She had   43  it very clear to everyone that we were tobehaveourselves in "a proper manner" and that there was to be "no yelling or shouting".

One orphan   44 was led up onto the stage and each kid was handed a   45  by Santa Claus himself.

As the line became shorter and shorter my   46  finally came. He smiled at me. Then he reached over and handed me a   47  box which had two gold ribbons(丝带) on it. As I leaned(向前倾) to take the box I tripped and I   48 to my knees. Santa reached over and helped me to my feet.

"Move  49  Kiser." called out Mrs. Winters.

I was now leaning against Santa Claus' leg and I was looking   50  into his eyes. His face was less than an inch from mine.

"Can I   51  you Santa?" I asked him.

The next thing I knew Mrs. Winters had caught me up by my shirt collar and was  52  me away from the line of children.

I sat down in my chair just crying. Once in a while I would  53  at the stage to see if my gift was still sitting by Santa Claus.

When we all lined up waiting, I  54 "HO HO HO" coming from behind me.

As I   55 , there stood Santa Claus holding my large box. Then he knelt down and he hugged my neck as hard as he could.

36. A. stand up           B. go out               C. sit down            D. keep silent

37. A. taken               B. served               C. brought             D. supplied

38. A. until                  B. unless               C. before               D. after

39. A. table                   B. hotel                 C. seat                   D. stage

40. A. encouragement  B. excitement        C. disappointment D. astonishment

41. A. loud                  B. big                   C. high                  D. low

42. A. outside               B. beside              C. aside                 D. inside

43. A. took                  B. made            C. demanded         D. warned

44. A. at a time          B. at one time        C. at time’s            D. at time

45. A. favor                      B. box                C. gift                  D. medal

46. A. turn                   B. way                 C. chance              D. gift

47. A. golden                      B. yellow              C. small                D. large

48. A. sat                     B. fell                  C. dropped            D. turned

49. A. by                     B. on                 C. in                    D. out

50. A. quickly            B. directly            C. immediately      D. finally

51. A. tell                            B. call                  C. hug                  D. leave

52. A. pushing              B. keeping             C. stopping            D. pulling

53. A. look                 B. jump              C. put                 D. stand

54. A. watched           B. found               C. heard                      D. observed

55. A. turned around      B. turned up          C. turned away       D. turned down

肝硬化时造成门静脉压升高的因素有（）

A.假小叶压迫小叶下静脉

B.门静脉与肝动脉的吻合

C.结缔组织增多压迫肝动脉

D.肝动脉内气压升高

E.肝内各种血管破坏减少使门脉回流受阻

脂肪肝的营养治疗为（）。

A.必须减轻体重和严格控制能量摄入

B.控制能量摄入，但不能骤减

C.能量摄入可不受限制

D.控制蛋白质的摄入

E.控制必需脂肪酸的摄入

医学道德是永恒不变的。