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 and 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
When you talk, other people hear your voice ______.
A．throught the bones of your head
B．from the outside
C．from the inside
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