单项选择题

A．Librarian and student.
B．Customer and repairman.
C．Boss and secretary.
D．Operator and caller.
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单项选择题
A．General manager.B．An official worker.C．A secretary.D．Head of the personnel department.
A．General manager.
B．An official worker.
C．A secretary.
D．Head of the personnel department.
单项选择题
What is the key to the shark’s swift locomotion in water
A．The jaw.
B．The tail.
C．The muscle.
D．The skin.
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