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．ballet.B．Swimming.C．Nursing.D．Teaching
A．ballet.
B．Swimming.
C．Nursing.
D．Teaching
单项选择题
A．Commenting on a picture.B．Looking at some paint.C．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.
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