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
The sound of your voice begins ______.
A． inside your head
B． outside your head
C． in your inner ears
单项选择题
People on foot can go across the road when ______.
A． the traffic lights are green
B． they look to the right
C． the road is clear
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