单项选择题

A．The importance of good dental care.
B．The use of medical discoveries of the Renaissance.
C．The state of medicine before the Renaissance.
D．The skills necessary for good dentistry.
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单项选择题
A．The wild yak is strong.B．The wild yak’s color is black, white or dark brown.C．Its hooves are big and strong.D．It’s hair is as short as that of ox.
A．The wild yak is strong.
B．The wild yak’s color is black, white or dark brown.
C．Its hooves are big and strong.
D．It’s hair is as short as that of ox.
单项选择题
A．Customer and salesman.B．Employee and boss.C．Colleagues.D．Classmates.
A．Customer and salesman.
B．Employee and boss.
C．Colleagues.
D．Classmates.
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