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 EI Nino is name given to the mysterious and often unpredictable change in the climate of the world. This strange 31 happens every five to eight years. It starts in the Pacific Ocean and is thought to be caused by a failure in the trade winds( 信 风 ) , which affects the ocean currents driven by these winds. As the trade winds lessen in 32 , the ocean temperatures rise causing the Peru current flowing in from the east to warm up by as much as 5 0 C. The warming of the ocean has far-reaching effects. The hot, humid( 潮 湿 的 )air over the ocean causes severe 33 thunderstorms.The rainfall is increased across South American, 34 floods to Peru. In the West pacific, there are droughts affecting Australia and Indonesia. So while some parts of the world prepare for heavy rains and floods, other parts face drought, poor crops and 35 . EI Nino usually lasts for about 18 months. The 1982-83 EI Nino brought the most 36 weather in modern history. Its effect was worldwide and it left more than 2,000 people dead and caused over eight billion pounds 37 of damage. The 1990 EI Nino lasted until June 1995. Scientists 38 this to be the longest E1 Nino for 2,000 years. Nowadays, weather experts are able to forecast when an E1 Nino will 39 ,but they are still not 40 sure what leads to it or what affects how strong it will be.