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

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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
One form of lightning that______is ball lightning.

选项

答案A

解析 根据第三段的最后一句话可以判断出答案。
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