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发布时间：2009-11-25
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资源简介：2010乐清市鹤阳中学高考英语模拟试题

The El Nino of '97-98 was one of the most destructive weather cycles, bringing with it more energy than a million Hiroshima bombs(广岛原子弹爆炸). It killed nearly 2,100 people worldwide. As if that wasn't bad enough, El Nino was followed by one of the worst La Nina cycles in recent history - the very next year.
El Nino is a weather pattern that passes through the Equatorial(赤道的) Pacific Ocean every couple of years. In the past 98 years, there have been 23 El Nino systems recorded. El Nino is associated with warmer ocean currents but that's not all that happens when this system passes through.
Air pressure changes during El Nino cause higher temperatures and when they are combined with warmer ocean currents, evaporation（蒸发）takes place at a greater speed. All these elements combined lead to drastic changes in normal weather patterns and abnormal amounts of rain during an El Nino cycle. These rainstorms take place within the Equatorial Pacific Ocean - causing massive flooding for the countries in that area, including the United States, Peru and other parts of South and Central America. While the Eastern Pacific area is being pummeled by extra rain, areas like Australia, Indonesia and India deal with severe drought. This is because much of the moisture that is normally dispersed （使疏散，使散开）around the world is evaporating too quickly and staying within the Eastern Pacific Ocean.
Just like everything in the world, El Nino has an opposite, too. La Nina is a weather system that hits the Pacific Ocean between December and March. While there are mild winters and flooding associated with El Nino, the complete opposite is true when La Nina arrives. La Nina brings harsh winters with drought and abnormally low temperatures.
There was a time when these two weather patterns were responsible for thousands of deaths. During the El Nino cycle in 1789, 600,000 people died in one region of India due to severe drought. Thanks to modern science, scientists are now able to predict when we will see these weather systems pass through. This doesn't mean we can necessarily lessen the physical damage they cause but hopefully their predictions will help to save more lives in the future.