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．24.B．12.C．18.D．6.
A．24.
B．12.
C．18.
D．6.
单项选择题
A．Yes, I know you.B．Of course, if you like.C．Glad to meet you.D．See you tomorrow.
A．Yes, I know you.
B．Of course, if you like.
C．Glad to meet you.
D．See you tomorrow.
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