If you see someone drowning, speed is very important. Once you get him out of the  31  , if he isn't  32  , you have four minutes before his brain is completely  33  . Support his neck, tilt (使翘起) his head back and press his chin (下巴) upwards. This  34  the tongue blocking the airway in the throat and is sometimes enough to get him breathing again. If that doesn't  35  , start mouth-to-mouth breathing. Press his nostrils (鼻孔)  together with your  36  . Open your  37 wide and take a deep breath. Blow into his lungs until his chest  38  . Then remove your mouth and watch his chest fall. Repeat twelve times a minute. Keep doing  39   help arrives.

To bring a child back to 40   keep your lips around his mouth and nose and gently  41  his mouth. Give the first four breaths as quickly as possible to  42  the blood with oxygen. If,  43  your efforts, he starts turning a blue grey colour, you can  44   no pulse (脉搏),then pressing is the  45 chance of saving his life.

With arms straight, rock (摆动) forwards pressing down on the lower half of the breastbones. Don't be too hard  46 you may break a rib (肋骨). Check how effective you are seeing if his colour  47 or his pulse becomes independent to your chest 48  . If this  49  , stop the pressing. Otherwise  50  until the rescue arrives.

31. A. ground        B. room          C. water          D. forest

32. A. dying         B. breathing       C. swimming      D. crying

33. A. destroyed      B. covered        C. thinking        D. moved

34. A. keeps         B. makes          C. does           D. stops

35. A. work          B. matter         C. breath          D. start

36. A. feet           B. arm            C. fingers         D. face

37. A. eyes          B. hand           C. mouth         D. tongue

38. A. falls           B. moves         C. becomes warm   D. rises

39. A. when          B. after           C. as             D. until

40. A. speak         B. life            C. safety          D. smile

41. A. touch         B. press           C. open           D. blow into

42. A. make          B. fill            C. produce        D. watch

43. A. as a result of    B. because of      C. in spite of       D. thinking of

44. A. feel           B. get            C. watch          D. see

45. A. best           B. first           C. latest          D. last

46. A. but           B. or             C. so             D. since

47. A. improves       B. changes        C. remains the same    D. is still good

48. A. hitting         B. touching        C. pressing        D. moving

49. A. does          B. happens        C. works          D. disappears

50. A. pressing       B. keep           C. go             D. continue

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