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
单项选择题
Jackie complained that nobody was doing anything to _______.
A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
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