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    3．In  earliest times，men  considered  lightning to be  one of the  great  mysteries of  nature．Some ancient peoples believed that lightning and thunder were the weapons of the gods．
    In  reality，lightning is a flow of  electricity  formed high above the earth．A single  flash of lightning 1.6 kilometres 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（避雷针）．This device protects buildings from being damaged by lightning．
    Modern science has discovered that one stroke of lightning has a voltage（电压）of more than 15 million  volts．A flash of  lightning 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 judge that there are about 2，000 million flashes of lightning per year．Lightning hits the Empire State  Building in New York City 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 shoud go to low ground and  not  get  under a tree．Also，one should  stay out  of water  and away  from  metal fences．Inside a  house，people  should avoid  open  doorways  and windows  and not touch  wires or metal things．
    With lightning，it is better to be safe than sorry．

    31．People once thought lightning came fromB．
    A．the sky             B．the gods          C．the earth            D．nature
    32．According to the passage what do you think all buildings need？C
    A．Metal fences．B．Electricity．C．lightning rods．D．Machines．
    33．Lightning can travelD．
    A．as quickly as water
    B．not so quickly as electricity
    C．at very low speed
    D．at very high speed
    34．Which of the following is NOT true？C
    A．In the U．S．about 360people die from lightning in a year．
    B．The Empire State Building frequently gets hit by lightning．
    C．Swimming during a thunder storm is a good idea．
    D．A closed car is the best place to be during an electrical storm．
    35．Lightning is probablyA to man．
    A．useful              B．kind             C．useless             D．friendly．

    分析 本文讲述了人们对于闪电的认识历史以及知识科普．

    解答 31．B．细节题．由第一段Some ancient people believed that lightning and thunder were the weapons of the gods．一些古代的人认为雷声和闪电是诸神的武器．故选B
    32．C．细节题．第三段In the same year he also built the first lightning rod （避雷针）．This device protects buildings from being damaged by lightning．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．故选C
    33．D．细节题．第四段A flash of lightning between a cloud and the earth may be as long as 13 kilometers，and travel at a speed of 30 million meters per second．闪电能够以每秒3000万米的速度传播．可知，它的速度相当快．故选D
    34．C．细节题．第六段one should stay out of water and away from metal fences．在雷雨交加的天气，人们也应该远离水和金属物．因此，在雷雨天气中，游泳时一个好主意是错误的．故选C
    35．A．推理判断题．由第二段A single  flash of lightning 1.6 kilometres long has enough electricity to light one million light bulbs，一束长1.6公里的闪电，有足够的电力点亮100万个灯泡．可知闪电是有用的，故选A．

    点评 本篇文章主要是细节理解方面的题型，需要考生通过跳读迅速找到对应的句子进行详细理解，句子的理解可以结合上下文意思，通过逻辑推理得到．

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