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
Cloud lightning looks like a ribbon when its lightning channel______.
选项
答案B
解析 与答案有关的句子在第四段中能找到。这个句子是When cloud—to—ground lightning occurs during strong winds，they can shift the lightning channel sideways，so it looks like a ribbon．
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