填空题

  • A. Cloud-to-ground lightning occurring in the U. S.
  • B. Types of lightning
  • C. Cause of lighruing
  • D. Differences between thunder and thunderstorm
  • E. Frequencies of thunderstorms occurring in the world and the U. S.
  • F. Shockwaves as thunder

Paragraph 4 ______.

【参考答案】

B
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One form of lightning that ______ is hall lightning.
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