单项选择题

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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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
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