单项选择题

A．what
B．that
C．although
D．when
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单项选择题
Who is the woman
A．A recording artist.
B．A French teacher.
C．A student.
D．An engineer.
单项选择题
What is the main topic of the conversation
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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