单项选择题

A．Teacher and student.
B．Waiter and customer.
C．Patient and doctor.
D．Stewardess and passenger.
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单项选择题
A．AII right.B．Yes, here you are.C．Yes, my eyes are full of tears.D．Never mind.
A．AII right.
B．Yes, here you are.
C．Yes, my eyes are full of tears.
D．Never mind.
填空题
It is important that the environment (protect) ______.
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