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
One form of lightning that______ is ball lightning.
选项
答案A
解析 第四段能找到与答案有关的句子，即Ball lightning，the rarest and most mysterious form，derives its name from the small luminous ball…关键词是rare。
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