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 mad others hear your voice
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单项选择题
The story tells us that ______.
[A] a dream may come true some time later
B. a dream is always a dream
C. people should not believe their dreams
单项选择题
Sound travels in the form(形式)of ______.
A． bones
B． air
C． waves
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