单项选择题

A．professor and student.
B．shop assistant and customer.
C．librarian and reader.
D．two friends.
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单项选择题
A．commenting on a picture.B．looking at some paintC．painting a picture.D．comparing two paintings.
A．commenting on a picture.
B．looking at some paint
C．painting a picture.
D．comparing two paintings.
单项选择题
A．Buy something to eat on the train.B．Take the five o’clock trainC．Wait to catch a later train.D．Take the train to the airport.
A．Buy something to eat on the train.
B．Take the five o’clock train
C．Wait to catch a later train.
D．Take the train to the airport.
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