单项选择题

A．23C.
B．32C.
C．132C.
D．l23C.
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单项选择题
A．It is not as good as fire.B．It might cause health problems.C．It is safe when the factory’s instructions are followed.D．It is the most widely-used way of cooking in the world.
A．It is not as good as fire.
B．It might cause health problems.
C．It is safe when the factory’s instructions are followed.
D．It is the most widely-used way of cooking in the world.
单项选择题
A．Doctor and patient.B．Secretary and visitor.C．Manager and clerk.D．Teacher and student.
A．Doctor and patient.
B．Secretary and visitor.
C．Manager and clerk.
D．Teacher and student.
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