单项选择题

A．At the beginning of the semester.
B．At the middle of the semester.
C．At the end of the semester.
D．During vacation.
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单项选择题
A．How lightning is produced.B．The loudness of thunder.C．The relationship between lightning and thunder.D．How to determine the location of a lightning flash.
A．How lightning is produced.
B．The loudness of thunder.
C．The relationship between lightning and thunder.
D．How to determine the location of a lightning flash.
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