填空题

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

Paragraphs 2 and 3______

【参考答案】

C
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