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
Although not fully understanding processes of lightning man______.
选项
答案D
解析 第二段谈到了“对闪电过程没有全部弄清楚”(though processes are still not fully understood…)，但是，第二段至第四段解释了闪电的成因及闪电的类型和形状。人类对闪电、雷雨现象具有相当充分的了解。
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