单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Customer and clerk.
B．Professor and student.
C．Boss and employee.
D．Lawyer and client.
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单项选择题
A．To cut trees.B．To carry rocks.C．To destroy the trunks of trees.D．To carry the twigs of trees.
A．To cut trees.
B．To carry rocks.
C．To destroy the trunks of trees.
D．To carry the twigs of trees.
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