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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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
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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