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 phrase pick up'here means ______.
A． to raise
B． to get
C． to choose
单项选择题
When you talk, other people hear your voice ______.
A． through the bones of your head
B． from the outside
C． from the inside
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