单项选择题

A．Asia.
B．Africa.
C．America.
D．Europe.
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单项选择题
A．Anesthetics.B．Pulled teeth.C．Home service.D．Pain-free service.
A．Anesthetics.
B．Pulled teeth.
C．Home service.
D．Pain-free service.
单项选择题
A．Almost one million.B．About 600 thousand.C．Nearly 400 thousand.D．Approximately 200 thousand.
A．Almost one million.
B．About 600 thousand.
C．Nearly 400 thousand.
D．Approximately 200 thousand.
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