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
答案解析
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
