填空题

  • 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 hall lightning.

【参考答案】

A
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