题型:阅读理解 题类:模拟题 难易度:普通
山东省潍坊市2021届高三下学期英语5月模拟考试试卷(三模)
Thunderstorms often show up uninvited to Carnival (狂欢节) in Brazil. This year's attempt to influence the skies took place in Sao Pablo by a party's official sponsor, Skoal, a Brazilian beer brand. "The fun stops when it rains," says Pedro Ada my, Skoal's marketing director. So do beer sales.
An airplane painted with Skoal's logo sprayed (喷洒) water droplets into clouds to make rain fall before the clouds reached the city. According to its YouTube video that has been viewed 12 million times, it is a "mission worthy of science fiction".
Whether it's science or fiction is up for debate. The use of cloud-seeding to increase rainfall dates back to the 1940s. But the United States government stopped funding it in the 1980s due to a lack of" scientific proof of the effectiveness of intentional weather change", according to the National Research Council. A new paper based on experiments in Idaho found that seeding clouds with silver iodide increased snowfall on three occasions, but the authors say that more research is needed to find out if it can reliably promote precipitation (降水), Pablo Tartar, a Brazilian physicist, says flatly that cloud-seeding is "useless".
Still, governments and firms in many countries use the technology. Sao Pablo's water company has signed million dollar contracts with ModClima to bring rain, most recently during a drought in 2014-15. Although cloud-seeding normally uses a chemical such as silver iodide to provide a surface around which water or ice droplets form, ModClima says it has invented an "experimental" method that uses water alone.
Carnival-goers cheered when the first two days were cloudy but dry. Many shared Skol's video. But at around 5pm on February 24th, the sky darkened and rain poured down. Celebrants at one block party left the Skol stands and rushed to buy umbrellas and plastic rain capes.
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