单项选择题

How do the scientists measure the pitch

A．According to the movement and vibrations of hot gasses.
B．The trade winds blow on Earth.
C．The rivers.
D．The sound travel through the space.
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单项选择题
According to the context tooth transplanting _______.
A．will not be realized in the near future
B．is still at a trial period
C．is but a dream
D．has been widely practiced
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