EI NIno is name given to the masterious and often unpredictable change in the climate of the world.This strange ___1_____happens every five to eight years.It starts in the PAacific Ocean and is thought to be caused by a failure in the trade winds，which affects the ocean currents driven by these winds. As the trade winds lessen in ____2___,the ocean comperatures rise causing the Peru current flowing in form the east to warm up by as much as 5`C.
The warming of the ocean has far-reaching effects.The hot,humidair over the ocean causes severe __3___thunderstorms.The rainfall is increased acrossAounth American ____4___floods to Peru.In the West pacific,there are droughts affecting Australia and Indonesia.So while some parts of the world perpare for heavy rains and floods,other parts face drought,poor crops and____5____.
EI Nino usually lasts for about 18 months The 1982-83 EI Nino brough the most___6____weather in mordern history .Its effect was worldwide and it left more than 2,000 people dead and caused over eight billion pounds ____7___of damage.The 1990 EI Nino will ____55___,but they are still not __56___sure what leads to it or what affects how strong it will be.
A)estimate I)completely
B)strength J)destructive
C)deliberately K)starvation
D)notify L)bringing
E)tropical M)exhaustion
F)phenomenonN)worth
G)stable O)strike
H)attraction
答案与解析：
47. P phenomenon
48. B strength
49. E tropical
50. L bringing
51. K starvation
52. J destructive 53. N
worth
54. A estimate
55. O strike
56. I completely
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