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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