单项选择题

A．Light darkens silver salt.
B．Light darkens natural salt.
C．Light darkens silver.
D．Light darkens self-developing film.
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单项选择题
A．Artists.B．Musicians.C．Tour guides.D．Businessmen.
A．Artists.
B．Musicians.
C．Tour guides.
D．Businessmen.
单项选择题
A．The University faculty.B．The Student Association.C．Former students.D．No one.
A．The University faculty.
B．The Student Association.
C．Former students.
D．No one.
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