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It¡¯s difficult for doctors to help a person with a hurt brain. ¡¡36 ¡¡enough blood, the brain can live only three to five minutes. Usually doctors can¡¯t fix the hurt ¡¡37 ¡¡such a short time.

Dr Robert White thinks he knows a ¡¡38 ¡¡of help. He thinks doctors should make the hurt brain ¡¡39 ¡¡to live for 30 minutes without blood. This gives the doctor ¡¡40 ¡¡time to do something for the brain. Dr White experimented his ¡¡41 ¡¡on fifteen monkeys. ¡¡42 ¡¡he taught them to do different jobs. Then he operated on them. He made the monkeys¡¯ blood go ¡¡43 ¡¡a machine. When the brains¡¯ ¡¡44 ¡¡was 10¡æ, he stopped the blood to the brain. After 30 minutes, he turned the blood back on. He ¡¡45 ¡¡the blood again. After their operations, the monkeys were almost ¡¡46 ¡¡before. They were healthy and busy. Each one could still do the job the doctor ¡¡47 ¡¡them.

Dr White¡¯s idea works well on monkeys. He thinks it will work on ¡¡48 . He thinks it will help with heart problems. A person ¡¡49 ¡¡die when his heart stops; doctors can ¡¡50 ¡¡it again. The problem comes: when the brain is without blood for about 5 minutes, it ¡¡51 . If doctors start the heart again after 5 minutes, the person has ¡¡52 ¡¡body but a dead brain. Maybe in the future, doctors will ¡¡53 ¡¡Dr White¡¯s idea. When the person¡¯s heart stops the doctor will ¡¡54 ¡¡cool the brain. They will have 30 minutes to start the heart again. Maybe there will be no ¡¡55 ¡¡the brain.

36. A. Don¡¯t have¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. Without¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. Having not¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. Only with

37. A. for¡¡ ¡¡¡¡ ¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. after¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. in¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. since

38. A. way¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. brain¡¡ ¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. doctor¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. man

39. A. too cool¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. cool too¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. cool enough¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. enough cool

40. A. a longer¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. enough¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. a shorter¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. another

41. A. medicine¡¡ ¡¡¡¡ ¡¡¡¡¡¡¡¡ B. manners¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. idea¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. brain

42. A. Besides¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. Instead¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. However¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. First

43. A. to ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. across¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡C. through¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. onto

44. A. heat¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. temperature¡¡ ¡¡ ¡¡¡¡C. coolness¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. feeling

45. A. cooled ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. operated¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. warmed¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. stopped

46. A. the same as ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. different from¡¡ ¡¡¡¡¡¡¡¡¡¡ C. used to¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. cleverer than

47. A. was taught¡¡ ¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. was teaching¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡ C. was to teach ¡¡¡¡¡¡ ¡¡¡¡D. had taught

48. A. other people ¡¡¡¡¡¡¡¡ B. human beings¡¡ ¡¡¡¡¡¡¡¡¡¡ C. other things¡¡ ¡¡¡¡ ¡¡¡¡D. more people

49. A. doesn¡¯t have to¡¡ B. needn¡¯t¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. will be able to¡¡ ¡¡¡¡¡¡¡¡¡¡ D. is afraid to

50. A. start¡¡ ¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. take¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. make¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. begin

51. A. loses¡¡ ¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. goes ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡C. kills¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. dies

52. A. no¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. a dead¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. a living¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. a lively

53. A. get ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. accept¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. keep¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡D. try

54. A. soon ¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡ B. quickly ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡C. slowly¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. rapid

55. A. use for¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. wrong with¡¡ ¡¡¡¡¡¡ ¡¡¡¡C. value to¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. problem with

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