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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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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
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