单项选择题

The phrase "pick up" here means ______.

A．to raise
B．to get
C．to choose
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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
单项选择题
Sound travels in the form (形式) of ______.
A．bones
B．air
C．waves
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