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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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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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