问题 单项选择题

性感染性心内膜炎好发于原先有损害的瓣膜,最常见于()

A.风湿性心脏病二尖瓣病变

B.三尖瓣先天性畸形

C.动脉粥样硬化累及主动脉瓣

D.心力衰竭

E.肺心病

答案

参考答案:A

解析:感染性心内膜炎是由病原微生物引起的心内膜炎,主要是由细菌引起故毛称为细菌性心内膜炎,通常分为急性和亚急性心内膜炎两种。亚急性感染性心内膜炎主要由细菌引起,最常见的病原菌为草绿色链球菌;肠球菌、革兰氏阴性杆菌、真菌亦可引发本病。常发生在已有病变的瓣膜上,如风湿性瓣膜病或并发于先天性心脏病(如室间隔每损、Fallot四联症等)。行修补术后的瓣膜也容易被感染。此型心内膜炎最常侵犯二尖瓣和主动脉瓣。

单项选择题 A1/A2型题
完形填空

第二节  完形填空(共20小题;每小题2分,满分40分)

阅读下列短文,掌握其大意,然后从36—55各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。并将答案写在答题卡上。

John Henry was a young man, and he was one of the best steel-drivers in the country,He cjould work for hours without missing a beat, People said he worked so fast that his  36    moved

Like lightening

One day,a salesman came to the work area with a new   37    machine by powered steam, He said it could drill holes    38   than twelve men working together, The railroad company  39 to buy the machine if it worked as well as the salesman said.

The supervisor(监工头) said,”I have the best steel-driver in the   40     , He can beat more than twenty men working together,”The salesman   41    the statements. He said the company could have the machine without cost   42    he was faster, The supervisor told John about it and said “How about a   43    ?” John Henry looked at the machine and saw   44    of the future, He saw machines taking   45    of America’s best laborers, He saw himself and friends   46   and standing by a road ,asking for food, He saw men losing their families and their    47    as human beings , John Henry told the supervisor he would never let the machine take his job, His friends all cheered.

The competition began, John Henry  48   his hammer and started working. At first, the steam-powered drill worked two times faster than he did,    49     he started working with a hammer in each hand. He worked faster and faster. In the mountain , the dust was so    50   that most men would have had trouble   51    . After a while , the machine was pulled from the tunnel , It had broken down, . But John Henry   52    working faster and faster. At last he became weak ,and his heart    53    . John Henry fell to the ground .”I beat them,” Then he took his 54    breath.

Soon, the steam drill and other machines replaced the steel-drivers ,.Many   55   left their families, looking for work, They took the only jobs they could find, As they worked, some sang about John Henry,

36.A  broom,           B  hammer          C hand         D sleeve

37.A washing            B drilling             C sewing        D flying

38. A quickly            B slower              C faster         D fast

39. A managed         B allowed             C refused       D planned

40 A family             B class               C film           D country

41. A doubted          B hated               C disagreed      D decided

42. A when             B if                   C unless          D despite

43. A lesson             B race                C unless         D despite

44.A images            B faces                C plans          D signs

45. A the place         B the room             C the space       D the air

46. A excited         B unemployed          C moved         D encouraged

47. A food             B rights              C wages       D houses

48.A touched           B kicked              C kissed        D stamped

49. A Otherwise         B But               C Then          D However

50. A thin               B big               C high          D thick

51. A laughing          B talking             C breathing      D singing

52.A stopped           B kept                C enjoyed       D suggested

53. A burst              B worked            C ran           D lived

54.A  own              B deep              C best          D last

55. A laborers          B women             C villagers       D salesmen