A、occurs most infrequently B、is shifted sideways by strong winds C、strike twice or more in the same spot D、is equipped with a go

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问题 A、occurs most infrequently
B、is shifted sideways by strong winds
C、strike twice or more in the same spot
D、is equipped with a good knowledge of various forms of lightning
E、is estimated at 20 million a year
F、is positively charged
Cloud lightning looks like a ribbon when its lighting channel________.

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答案B

解析 根据第三段第五句话可知答案。
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