单项选择题

A．answer questions about its temperature
B．translate the sounds into images
C．know how gases inside ebb and flow
D．measure the pitch
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单项选择题
A．prevent people from having trouble with teethB．stop teeth from falling outC．put men on the moonD．transplant hearts and other organs
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
单项选择题
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 spac
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 spac
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