单项选择题

The passage is mainly about ______.

A．waves in the air
B．the way you hear your own voice
C．the different ways you mad others hear your voice
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单项选择题
The Black Forest is ______.
A．a place in Germany
B．not a real place
C．invented by the writer
单项选择题
It was ______ that saved the man's life 20 years later.
A．a voice
B．the dream
C．someone else
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