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　　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(信風)，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,humid(潮濕的)air 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 ____9___,but they are still not __10___sure what leads to it or what affects how strong it will be.

　　A)estimate

　　B)strength

　　C)deliberately

　　D)notify

　　E)tropical

　　F)phenomenon

　　G)stable

　　H)attraction

　　I)completely

　　J)destructive

　　K)starvation

　　L)bringing

　　M)exhaustion

　　N)worth

　　O)strike

　　【答案】

　　1. P phenomenon

　　2. B strength

　　3. E tropical

　　4. L bringing

　　5. K starvation

　　6. J destructive

　　7. N worth

　　8. A estimate

　　9. O strike

　　10. I completely