单项选择题

A．They can’t learn to swim naturally.
B．Their parents throw them into the sea.
C．They don’t know how to build nets.
D．They enjoy swimming in the sea.
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D
单项选择题
A．Manager and clerk.B．Doctor and nurse.C．Director and secretary.D．Professor and student.
A．Manager and clerk.
B．Doctor and nurse.
C．Director and secretary.
D．Professor and student.
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