简答题
专四
2013-01-17
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A．the sound of drilling is painful.
B．the woman has to have her tooth refilled.
C．teeth cannot be transplanted.
D．people can transplant hearts.
A．Doctors will try plastic teeth on people.
B．Doctors have made plastic teeth work on animals.
C．Toothache always bothers people.
D．Doctors are trying to transplant a person's tooth to another person.