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F

解析 利用段首句和段尾句中的用词特点:段首句和段末句中均出现了Thunder,因此这个词很可能是该段落的中心词,这样只有D和F可能是答案,但是D中提到的thunderstorm(雷暴)在该段落中根本没有出现,因此判断答案是F。
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