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(信风)，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(潮湿的)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
　　参考答案：
　　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

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(实习编辑：刘佰万)