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[originaltext] Lightning is a flow of electricity formed high above the eart
[originaltext] Lightning is a flow of electricity formed high above the eart
游客
2023-07-21
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问题
Lightning is a flow of electricity formed high above the earth. A single flash of lightning 1.6 kilometers long has enough electricity to light one million light bulbs.
The American scientist and statesman, Benjamin Franklin, was the first to show the connection between electricity and lightning in 1752. In the same year he also built the first lightning rod. This device protects buildings from damage by lightning. Modern science had discovered that one lightning contains over 15 million volts. A spark between a cloud and the earth may be as long as 13 kilometers, and travel at a speed of 30 million meters per second.
Scientists estimate that there are about 2 000 million flashes of lightning per year. Lightning hits the Empire State Building in New York 30 to 48 times a year. In the United States alone it kills an average of one person every day.
The safest place to be in case of an electrical storm is in a closed car. Outside one should go to low ground and not under a tree. Also, one should stay out of water and away from metal fences. Inside a house, people should avoid opening doorways and windows and not touching wires or metal things.
29. What is the main idea of the passage?
30.How many people might be killed by lightning an average week according to the passage?
31.Which of the following is a safe place in an electrical storm?
选项
A、Benjamin Franklin’s life.
B、Lightning electricity.
C、The lightning rod.
D、The Empire State Building.
答案
B
解析
主旨题。本文介绍雷电以及如何防雷击。由于选项为名词性短语,可估计本题考的是事实细节题或主旨题,听短文时要特别留意选项所示相关信息,并做好相应的标记。根据首句及高频词汇可知正确答案为B。
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