2. 外语
  3. A occurs most infrequently B is shifted sideways by strong winds C is often hidden from our view D is equipped with a good knowl

A occurs most infrequently B is shifted sideways by strong winds C is often hidden from our view D is equipped with a good knowl

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问题 A occurs most infrequently
B is shifted sideways by strong winds
C is often hidden from our view
D is equipped with a good knowledge of various forms of lightning
E is estimated at 20 millions a year
F is positively charged
In most cases of cloud-to-ground lightning the ground’s surface______.
选项
答案F
解析 第二段解释了云层与地面之间的闪电的成因，云层下部带负电荷，排斥地面表层的负电荷，所以，地面表层聚集的是正电荷。
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