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

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   
*
选项
答案A
解析 利用“ball lightning”作为答案线索词，答案相关句在第4段的最后一句。答案相关句：Ball lighthing，the rarest and most mysterious form,derives its name from the small luminous ball that appears near the impact point，moves horizontally,and lasts for several seconds．
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