In old times, man considered lightning to be one of the great mysteries(神秘事物)of nature. In fact a single flash of lightning 1. 6 kilometers long has enough electricity to light one million lamps.
The American scientist, Benjamin Franklin, was the first to suggest that lightning is in fact electricity formed between the earth and clouds high above. It happened in 1752. In the same year, he also built the first lightning rod(避雷针)to protect buildings from being struck by lightnings.
Modern science has discovered that lightning is very strong and powerful. A lightning between a cloud and the earth may be as long as 13 kilometers, and travels at a speed of 30 million meters per second. Scientists have the opinion that there are about 2, 000 million flashes of lightning per year. In the United States alone, it kills almost one person per day. The safest place to be in during an electrical storm is a closed car. Outside, one should go close to low ground for cover and not stop under a tree. Also one should stay out of water and away from metal fences. Inside a house people should keep away from open doorways and windows and not touch wires or metal things.
【小题1】From this passage we know lightning is . A．one of the great mysteries of natureB．electricity high above the earthC．a kind of lightD．the sound from the clouds【小题2】In the US . A．every person can see lightning every dayB．at least one person is killed by lightning every dayC．there are about 6 million flashes of lightning per yearD．about one person per day dies from lightning【小题3】During a lightning storm, it would be best if you . A．stand under a treeB．go outsideC．stay in a closed carD．stop near windows【小题4】A lightning rod can . A．prevent accidents caused by lightningB．stop lightningC．protect buildings from being washed awayD．delay the ing of lightningB
网友回答
(答案→)B
解析：文章介绍了闪电，以及在闪电中如何保护自己。
【小题1】B 细节题。根据第二段第二行lightning is in fact electricity formed between the earth and clouds high above.说明B正确。
【小题2】D 细节题。根据第三段第四行In the United States alone, it kills almost one person per day.说明D正确。
【小题3】C 细节题。根据第三段第五行 The safest place to be in during an electrical storm is a closed car.说明C正确。
【小题4】A 细节题。根据第二段3,4行In the same year, he also built the first lightning rod(避雷针)to protect buildings from being struck by lightnings.说明避雷针可以避免闪电发生的事故。