A. Cloud-to-ground lightening occurring in the US B. Types of lightening C. Cause of lightening D. Differences between thunder a

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问题 A. Cloud-to-ground lightening occurring in the US
B. Types of lightening
C. Cause of lightening
D. Differences between thunder and thunderstorm
E. Frequencies of thunderstorms occurring in the world and the US   
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选项

答案E

解析 段落中的例举的数字(100 ligntning strikes every second,8 million daily,20 million a year, or about 22,000 per day)对应E中所提到的雷暴发生频率。
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