单项选择题

Sound travels in the form (形式) of ______.

A． bones
B． air
C． waves
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单项选择题
The best title (标题) would be ______.
A． Buses in England
B． Traffic in England
C． Traffic Lights in England
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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