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    18．In old times，man considered lightning to be one of the greatest mysteries of nature．In fact，a single flash of lightning 1.6 km 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 to protect buildings from being struck by lightnin g．
    Modern science has discovered that lightning is very long and powerful．A lightning between a cloud and the Earth may be as long as 13 km，and travels at a speed of 30 million meters per second．Scientists have the opinion that there are about 2 billion 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．
    29．In the USA，D．
    A．every person can see lightning every day
    B．at least one person is killed by lightning every day
    C．there are about 6 million flashes of lightning per year
    D．about one person per day dies from lightning
    30．During a lightning storm，it would be best if youC．
    A．stand under a tree                  
    B．go outside
    C．stay in a closed car                
    D．stop near windows
    31． A lightning rod canA．
    A．prevent accidents caused by lightning      
    B．stop lightning
    C．protect building from being washed away   
    D．delay the coming of lightning．

    分析 本文是一篇科教类阅读，文章介绍了些古代的人认为雷声和闪电是诸神的武器．美国科学家发明了避雷针，这种装置能够保护建筑物不被闪电损坏，因此，所有的建筑都需要避雷针．

    解答 DCA
    29．D细节判断题．根据第三段In the United States alone，it kills almost one person per day．在美国，每年都会有个人被雷击而死．故选D．
    30．C细节理解题．根据第四段The safest place to be in during an electrical storm is a closed car．可知遇到暴风雨时，最安全的地方是关闭的车里．故选C．
    31．A理解判断题．根据第二段In the same year，he also built the first lightning rod to protect buildings from being struck by lightning．他发明了避雷针，这种装置能够保护建筑物不被闪电损坏．由此说明，避雷针可以避免闪电发生的事故．故选A．

    点评 本文考查细节题为主，细节题可以在文章中直接找到与答案有关的信息或是其变体．做这类题一般采用寻读法即先读题，然后带着问题快速阅读短文，找出与问题有关的词语或句子，再对相关部分进行分析对比，找出答案．

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