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单选题

正常成年人安静时的通气/血流比值是( )。

  • 0.048

  • 0.084

  • 0.48

  • 0.84

  • 0.24

单选题

正常人动脉血液中PO2分压为100mmHg时,血红蛋白的氧饱和度为( )。

  • 100%

  • 98%

  • 80%

  • 75%

  • 60%

单选题

氧解离曲线表示的是( )。

  • 血氧含量与空气中的氧含量的关系

  • 血液氧分压与血红蛋白氧饱和度的关系

  • 血液中氧容量与氧分压的关系

  • 溶解的血红蛋白与血液中氧分压的关系

  • 血红蛋白的氧含量与血液氧分压的关系

单选题

CO2运输的主要形式是( )。

  • 物理溶解

  • 氧合血红蛋白

  • 碳酸氢盐

  • 氨基甲酰血红蛋白

  • 碳酸

单选题

产生呼吸节律的基本中枢在( )。

  • 大脑皮质

  • 中脑

  • 下丘脑

  • 延髓

  • 脑桥

单选题

中枢化学感受器最敏感的刺激是( )。

  • 脑脊液中的CO2

  • 血液中的CO2

  • 血液中的H+

  • 脑脊液中的H+

  • 血液中的PO2降低

单选题

血液中H+增高主要是通过外周化学感受器兴奋呼吸中枢,理由是( )。

  • 中枢化学感受器对H+不敏感

  • H+难以通过血-脑屏障

  • H+对中枢化学感受器有抑制作用

  • 血液中H+可直接兴奋呼吸中枢

  • 脑脊液中的缓冲系统缓冲了脑脊液H+

单选题

On average, a successful lawyer has to talk to several ________ a day.

  • customers

  • clients

  • guests

单选题

When Lily came home at 5 pm yesterday, her mother ______dinner in the kitchen.

  • cooked

  • was cooking

  • cooks

完形填空

选择题

  Graffiti painting is traditionally a daredevil pursuit. Teenagers dodge security guards to put their names on trains and buses. But over the past decade, graffiti has all but disappeared from Britain's cities. Between 2007 and 2012 the number of incidents of graffiti recorded by the British Transport Police fell by 63%. A survey by the Environment Ministry shows that fewer places are blighted by tags than ever. Graffiti are increasingly confined to sanctioned walls, such as the Stockwell ball courts. In time the practice may die out entirely.

  The most obvious reason for the decline in tagging and train-painting is better policing. Numerous CCTV cameras mean it is harder to get away with painting illegally. And punishments are more severe. A generational shift is apparent, too. Fewer teenagers are getting into painting walls. They prefer to play with iPads and video games. Some have gone to art school and want to make money from their paintings. The Internet means that painters can win far more attention by posting pictures online than they can by breaking into a railway yard.

  Taggers and graffiti artists mostly grew up in the 1980s and 1990s. Those men—and almost all are men—are now older and less willing to take risks. Graffiti may eventually disappear. But for now the hobby is almost respectable. The former graffiti artists paint abandoned warehouses at the weekend. It has become something to do on a Sunday afternoon—a slightly healthier alternative to sitting and watching football.

  1.Teenagers are not afraid of being caught by security guards when they put their names on trains and buses. 1

  2.Less tags can be found in public places nowadays. 2

  3.Because of better policing graffiti decreases. 3

  4.Some teenagers go to art school in order to learn to paint walls. 4

  5.Taggers and graffiti artists are still willing to take risks. 5

__1__
  • T
  • F
__2__
  • T
  • F
__3__
  • T
  • F
__4__
  • T
  • F
__5__
  • T
  • F