In early September 2005,New Orleans was badly hit by Hurricane Katrina. The whole city was left in  36  . Thousands of citizens  37   their lives.

People feel very sad about this  38   disaster,  39   they should also consider the  40  human beings have played in changing our natural environment.

Scientists point out that the  41   from Hurricane Katrina may have been caused by human  42  . They believe the greenhouse effect has caused icebergs at both poles of earth to melt,  43   a rise in sea level. As most of the land in New Orleans  44   below sea level, it is possible that rising sea levels could have had  45  .

Along the seafront (滨海区),forests have been cut down to make  46   for hotels and restaurants. By  47   this shield (盾牌), the city lost one of its defenses against hurricanes.

We have all learnt that nature is a  48   system, of which Humans are just a very small  49  , with animals, plants and air. When we destroy some parts, the balance is  50   and  51   are more likely to happen. 

America produces the most greenhouse gas of all the countries and it  52   to sign  the “Kyoto Protocol” (京都协议书),which aims to limit waste gases. Perhaps Hurricane Katrina will act as  53   to the US Government. It should also  54   us that we should try our best to protect the earth  55   we regret it.

36. A. ashes             B. fires           C. ruins            D. courage

37. A. made              B. lost              C. killed            D. spent

38. A. natural         B. human         C. average            D. endless

39. A . so             B. meanwhile      C. and            D. but

40. A. joke            B. trick           C. role            D. game

41. A. death           B. flooding         C. earthquake     D. fortune

42. A. activity         B. action           C. living            D. impression

43. A. resulting from       B. resulting in          C. comparing to        D. focusing on

44. A. trembles         B. bathes             C. keeps             D. lies

45. A. an effort         B. an effect        C. a result        D. a reason

46. A. space              B. rooms             C. place           D. area

47. A. owning             B. keeping        C. canceling        D. losing

48. A. fishing          B. precious       C. balanced        D. unfortunate

49. A. creature            B. persons        C. hole            D. part

50. A. accustomed         B. varied             C. recovered       D. destroyed

51. A. hurricanes       B. disasters        C. earthquakes    D. volcanoes

52. A. refused        B. failed           C. decided         D. managed 

53. A. a model             B. a clock         C. an alarm        D. a system

54. A. inform          B. order          C. require             D. remind

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

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