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

Paragraph 4______

【参考答案】

B

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A．Cloud-to-ground lightning occurring in the U. S.B．Types of lightningC．Cause of lightningD．Differences between thunder and thunderstorm E Frequencies of thunderstorms occurring in the world and the U. S. F Shock waves as thunder Paragraph 4______