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
Sound travels in the form(形式)of ______.
A．bones
B．air
C．waves
单项选择题
The sound of your voice begins ______.
A．inside your head
B．outside your head
C．in your inner ears
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